Use absolute ordering in web.xml

[zrhoffman]

This fixes an issue encountered by Traffic Router in Dev CDN in a Box, probably since Spring Framework was upgraded to 5.2.20 in #6705:

	Caused by: java.lang.IllegalArgumentException: More than one fragment with the name [spring_web] was found. This is not legal with relative ordering. See section 8.2.2 2c of the Servlet specification for details. Consider using absolute ordering.

More complete log

07-Apr-2022 20:24:41.353 INFO [main] org.apache.catalina.startup.Catalina.load Server initialization in [3064] milliseconds
07-Apr-2022 20:24:41.465 INFO [main] org.apache.catalina.core.StandardService.startInternal Starting service [traffic_router_core]
07-Apr-2022 20:24:41.465 INFO [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet engine: [Apache Tomcat/9.0.43]
07-Apr-2022 20:24:41.798 SEVERE [main] org.apache.catalina.core.ContainerBase.startInternal A child container failed during start
	java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[traffic_router_core].StandardHost[localhost].StandardContext[]]
		at java.base/java.util.concurrent.FutureTask.report(FutureTask.java:122)
		at java.base/java.util.concurrent.FutureTask.get(FutureTask.java:191)
		at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:916)
		at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:843)
		at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
		at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384)
		at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374)
		at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
		at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
		at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140)
		at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909)
		at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262)
		at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
		at org.apache.catalina.core.StandardService.startInternal(StandardService.java:434)
		at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
		at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:930)
		at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
		at org.apache.catalina.startup.Catalina.start(Catalina.java:772)
		at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
		at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
		at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
		at java.base/java.lang.reflect.Method.invoke(Method.java:566)
		at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:342)
		at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:473)
	Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[traffic_router_core].StandardHost[localhost].StandardContext[]]
		at org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:440)
		at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:198)
		at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384)
		at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374)
		at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
		at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
		at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140)
		at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909)
		... 21 more
	Caused by: java.lang.IllegalArgumentException: More than one fragment with the name [spring_web] was found. This is not legal with relative ordering. See section 8.2.2 2c of the Servlet specification for details. Consider using absolute ordering.
		at org.apache.tomcat.util.descriptor.web.WebXml.orderWebFragments(WebXml.java:2260)
		at org.apache.tomcat.util.descriptor.web.WebXml.orderWebFragments(WebXml.java:2218)
		at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1294)
		at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:986)
		at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:303)
		at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)
		at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5082)
		at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
		... 27 more

Note:

This PR includes commits from #6727 so it will work, so #6727 should be merged first.

---

Which Traffic Control components are affected by this PR?

• Traffic Router

What is the best way to verify this PR?

1. Remove CrConfig backups (rm -rf dev/{traffic_router/db,traffic_monitor/*.backup.*}) and take a snapshot, as long as Sync Dev CDN in a Box snapshot #6727 is still open
2. In the Dev CDN in a Box, wait for Traffic Router to finish starting, until it says

   org.apache.traffic_control.traffic_router.core.config.ConfigHandler - Exiting processConfig: No json data to process

3. Verify that Traffic Router routes the Dev CiaB Delivery Service:

   dig @localhost -p 3053  cdn.dev-ds.ciab.test
   curl -vHHost:cdn.dev-ds.ciab.test localhost:3080

If this is a bugfix, which Traffic Control versions contained the bug?

• master (bf47303)

PR submission checklist

• This PR has tests
• This PR has documentation
• This PR has a CHANGELOG.md entry
• This PR DOES NOT FIX A SERIOUS SECURITY VULNERABILITY (see the Apache Software Foundation's security guidelines for details)

[zrhoffman]

Added instructions to take a snapshot before testing, #6729 is no longer based on/blocked by #6727

[ericholguin]

Looks good!

Built and started Dev CIAB using atc start
Waited for TR to finish and start
Performed the dig and curl commands and did not see any issues