Influx import rewrite

[flowchartsman]

fixes #825

[flowchartsman]

The CircleCI failures appear unrelated:

=== RUN   TestIntegration
component=registrar key=/services/foosvc/1.2.3.4:8080 value=http://1.2.3.4:8080 action=register
component=instancer prefix=/services/foosvc/ instances=1
==================
WARNING: DATA RACE
Read at 0x00c0001fc028 by goroutine 9:
  github.com/go-kit/kit/sd/etcdv3.(*client).close()
      /home/circleci/.go_workspace/src/github.com/go-kit/kit/sd/etcdv3/client.go:229 +0x69
  github.com/go-kit/kit/sd/etcdv3.(*client).Deregister()
      /home/circleci/.go_workspace/src/github.com/go-kit/kit/sd/etcdv3/client.go:220 +0x1d9
  github.com/go-kit/kit/sd/etcdv3.(*Registrar).Deregister()
      /home/circleci/.go_workspace/src/github.com/go-kit/kit/sd/etcdv3/registrar.go:84 +0xe8
  github.com/go-kit/kit/sd/etcdv3.runIntegration()
      /home/circleci/.go_workspace/src/github.com/go-kit/kit/sd/etcdv3/integration_test.go:79 +0xb73
  github.com/go-kit/kit/sd/etcdv3.TestIntegration()
      /home/circleci/.go_workspace/src/github.com/go-kit/kit/sd/etcdv3/integration_test.go:144 +0x3c6
  testing.tRunner()
      /usr/local/go/src/testing/testing.go:827 +0x162

Previous write at 0x00c0001fc028 by goroutine 27:
  github.com/go-kit/kit/sd/etcdv3.(*client).WatchPrefix()
      /home/circleci/.go_workspace/src/github.com/go-kit/kit/sd/etcdv3/client.go:145 +0x306

Goroutine 9 (running) created at:
  testing.(*T).Run()
      /usr/local/go/src/testing/testing.go:878 +0x650
  testing.runTests.func1()
      /usr/local/go/src/testing/testing.go:1119 +0xa8
  testing.tRunner()
      /usr/local/go/src/testing/testing.go:827 +0x162
  testing.runTests()
      /usr/local/go/src/testing/testing.go:1117 +0x4ee
  testing.(*M).Run()
      /usr/local/go/src/testing/testing.go:1034 +0x2ee
  main.main()
      _testmain.go:54 +0x221

Goroutine 27 (running) created at:
  github.com/go-kit/kit/sd/etcdv3.(*Instancer).loop()
      /home/circleci/.go_workspace/src/github.com/go-kit/kit/sd/etcdv3/instancer.go:44 +0x100
==================
component=registrar key=/services/foosvc/1.2.3.4:8080 value=http://1.2.3.4:8080 action=deregister
--- FAIL: TestIntegration (0.12s)
    integration_test.go:26: GetEntries("/services/foosvc/1.2.3.4:8080"): [] (OK)
    integration_test.go:37: Registered
    integration_test.go:59: Constructed Instancer OK
    integration_test.go:67: Constructed Endpointer OK
    integration_test.go:76: Endpointer saw Register OK
    integration_test.go:80: Deregistered
    integration_test.go:85: Checking Deregister: len(endpoints) = 1, err = <nil>
    integration_test.go:85: Checking Deregister: len(endpoints) = 0, err = <nil>
    integration_test.go:99: GetEntries("/services/foosvc/1.2.3.4:8080"): [] (OK)
    testing.go:771: race detected during execution of test

[peterbourgon]

Thanks!