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CI_FLAGS="-fkmsrcn -u 1/2 'Unit tests for pants and pants-plugins - shard 2'"

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jsirois 
Improved go remote library support.

GoFetch now supports remote libraries with nested packages as well as
implicit targets for transitive dependencies that fall within the same
remote import path root as an explicitly declared remote dependency.

The awkward fit of zip_url to the more generically named GoRemoteLibrary
is fixed by moving the task of fetching fully out to a Fetchers
subsystem that works by delegating based on matches against the remote
import path.  To support this, both GoRemoteLibrary and GoLocalSource
targets gain a consistent notion of `import_path` that matches the same
concept in go.

The existing zip download functionality for remote libraries on github
is extracted to a generic ArchiveFetcher implementation with a default
configuration that knows how to construct and github archive URLs and
unpack them.

Additionally, a 'go_remote_libraries' macro is introduced to allow for
depending on a suite of packages at a single revision without repeating
the version in the BUILD file.

Testing Done:
Tested this in Medium's mono-repo in a manual test case that's now
replicated by the `GoFetchIntegrationTest.test_issues_1998` test.

Also some ad-hoc testing of the fetcher options like so (flip default
github `.tar.gz` fetch to `.zip`):
```console
$ ./pants \
  --fetchers-mapping="{r'github.com/':'ArchiveFetcher'}" \
  --archive-fetcher-matchers="{r'github.com/(?P<user>[^/]+)/(?P<repo>[^/]+)':('https://github.com/\g<user>/\g<repo>/archive/{rev}.zip', 'master', 1)}" \
    compile contrib/go/examples/3rdparty/go/github.com/AdRoll/goamz:dynamodb
...
13:24:38 00:00   [resolve]
13:24:38 00:00     [ivy]
13:24:38 00:00       [cache].
13:24:38 00:00     [go]
                   Invalidated 1 target.INFO] Downloading https://github.com/AdRoll/goamz/archive/51b70b003.zip...

                   Invalidated 3 targets.INFO] Downloading https://github.com/bitly/go-simplejson/archive/v0.4.3.zip...

                   Invalidated 1 target.INFO] Downloading https://github.com/cbroglie/mapstructure/archive/25325b46b.zip...
...
$ $ tree .pants.d/compile/go/contrib.go.examples.3rdparty.go.github.com.AdRoll.goamz.dynamodb/pkg/linux_amd64/github.com/AdRoll/goamz/
.pants.d/compile/go/contrib.go.examples.3rdparty.go.github.com.AdRoll.goamz.dynamodb/pkg/linux_amd64/github.com/AdRoll/goamz/
├── aws.a -> /home/jsirois/dev/3rdparty/jsirois-pants4/.pants.d/compile/go/contrib.go.examples.3rdparty.go.github.com.AdRoll.goamz.aws/pkg/linux_amd64/github.com/AdRoll/goamz/aws.a
├── dynamodb
│   └── dynamizer.a -> /home/jsirois/dev/3rdparty/jsirois-pants4/.pants.d/compile/go/contrib.go.examples.3rdparty.go.github.com.AdRoll.goamz.dynamodb.dynamizer/pkg/linux_amd64/github.com/AdRoll/goamz/dynamodb/dynamizer.a
└── dynamodb.a

1 directory, 3 files
```

CI went green here:
  https://travis-ci.org/pantsbuild/pants/builds/76318249

Bugs closed: 1998, 2013

Reviewed at https://rbcommons.com/s/twitter/r/2655/

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Source Files on job 6286.3 (CI_FLAGS="-fkmsrcn -u 1/2 'Unit tests for pants and pants-plugins - shard 2'")