Remove server-tests.php

As far as I know server-tests.php is unmaintained and no longer
used for anything nowadays. Some of the new sections are supported
by run-tests.php itself nowadays and some server-based tests
(using the CLI server or php-fpm) are performed through different
means.

Dropping server-tests.php has been discussed in a bunch of PR
discussions already, so let's go ahead with it...

Author: nikic

README.TESTING

@@ -179,138 +179,3 @@ $str = "XYZABCD";
 echo substr($str,3,7);
 
 ?>
-
-[IMPORTANT NOTICE]
-------------------
-This is an addendum to README.TESTING with additional information
-specific to server-tests.php.
-
-server-tests.php is backward compatible with tests developed for
-the original run-tests.php script.  server-tests is *not* used by
-'make test'.  server-tests was developed to provide support for
-testing PHP under it's primary environment, HTTP, and can run the
-PHP tests under any of the SAPI modules that are direct executables,
-or are accessible via HTTP.
-
-[New features]
-----------------
-* Command line interface:
-  You can run 'php server-tests.php -h' to get all the possible options.
-* Configuration file:
-  the -c argument will allow you to use a configuration file.  This is
-  handy if you are testing multiple environments and need various options
-  depending on the environment.
-  see server-tests-config.php for details.
-* CGI Emulation:
-  Will emulate a CGI environment when testing with the cgi sapi executable.
-* HTTP testing:
-  can be configured to run test scripts through an HTTP server running
-  on localhost.  localhost is required since either the web server must
-  alias a directory to the php source directory, or the test scripts
-  must be copied to a directory under the web server
-  (see config options TEST_WEB_BASE_URL, TEST_BASE_PATH, and TEST_WEB_EXT)
-* New sections supported for test files (see below)
-
-When running tests over http, tests that require ini settings different that what
-the web server runs under will be skipped.  Since the test harness defines a number
-of ini settings by default, the web server may require special configuration to
-make testing work.
-
-[Example Usage]
-----------------
-Some (but not all!) examples of usage:
-
-1. run tests from the php source directory
-    php server-tests.php -p /path/to/php-cli
-
-2. run tests using cgi emulation
-    php server-tests.php -p /path/to/php-cgi
-
-3. run tests over http, copying test files into document root
-    php server-tests.php -w -u http://localhost/test -m /path/to/htdocs/test
-
-4. run tests over http, php sources have been aliased in web server
-    php server-tests.php -w -u http://localhost/test
-
-5. run tests using configuration file
-    php server-tests.php -c /path/to/server-tests-config.php
-
-6. run tests using configuration file, but overriding some settings:
-   (config file must be first)
-    php server-tests.php -c /path/to/server-tests-config.php -w -t 3 -d /path/to/testdir
-
-NOTE: configuration as described in README.TESTING still works.
-
-[New Test Sections]
-----------------
-In addition to the traditional test sections
-(see http://qa.php.net/write-test.php), several new sections are available
-under server-tests.
-
---POST--
-This is not a new section, but not multipart posts are supported for testing
-file uploads, or other types of POST data.
-
---CGI--
-This section takes no value.  It merely provides a simple marker for tests
-that MUST be run as CGI, even if there is no --POST-- or --GET-- sections
-in the test file.
-
---DESCRIPTION--
-Not used for anything, just a section for documenting the test
-
---ENV--
-This section get's eval()'d to help build an environment for the
-execution of the test.  This can be used to change environment
-vars that are used for CGI emulation, or simply to set env vars
-for cli testing.  A full example looks like:
-
-  --ENV--
-  return <<<END
-  PATH_TRANSLATED=$filename
-  PATH_INFO=$scriptname
-  SCRIPT_NAME=$scriptname
-  END;
-
-Some variables are made easily available for use in this section, they
-include:
-  $filename     full native path to file, will become PATH_TRANSLATED
-  $filepath     =dirname($filename)
-  $scriptname   this is what will become SCRIPT_NAME unless you override it
-  $docroot      the equivalent of DOCUMENT_ROOT under Apache
-  $cwd          the directory that the test is being initiated from
-  $this->conf   all server-tests configuration vars
-  $this->env    all environment variables that will get passed to the test
-
-
---REQUEST--
-This section is also eval'd, and is similar in nature to --ENV--.  However,
-this section is used to build the url used in an HTTP request.  Valid values
-to set in this section would include:
-  SCRIPT_NAME   The initial part of the request url
-  PATH_INFO     The pathinfo part of a request url
-  FRAGMENT      The fragment section of a url (after #)
-  QUERY_STRING  The query part of a url (after ?)
-
-  --REQUEST--
-  return <<<END
-  PATH_INFO=/path/info
-  END;
-
---HEADERS--
-This section is also eval'd.  It is used to provide additional headers sent
-in an HTTP request, such as content type for multipart posts, cookies, etc.
-
-  --HEADERS--
-  return <<<END
-  Content-Type=multipart/form-data; boundary=---------------------------240723202011929
-  Content-Length=100
-  END;
-
---EXPECTHEADERS--
-This section can be used to define what headers are required to be
-received back from a request, and is checked in addition to the
-regular expect sections.  For example:
-
-  --EXPECTHEADERS--
-  Status: 404