Move over internal ingester code to OSS

[vprithvi]

Which problem is this PR solving?

• See Kafka Ingester #929

Short description of the changes

• This commit moves over code used internally at Uber to GitHub so that @davit-y may continue the work of adding initialization code.
• The only changes done were moving import paths to GitHub, adding License headers and glide dependencies.

[codecov]

Codecov Report

Merging #940 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master   #940    +/-   ##
======================================
  Coverage     100%   100%            
======================================
  Files         126    136    +10     
  Lines        6080   6322   +242     
======================================
+ Hits         6080   6322   +242

Impacted Files	Coverage Δ
cmd/ingester/app/consumer/offset/manager.go	100% <100%> (ø)
...md/ingester/app/consumer/offset/concurrent_list.go	100% <100%> (ø)
cmd/ingester/app/processor/metrics_decorator.go	100% <100%> (ø)
cmd/ingester/app/consumer/consumer.go	100% <100%> (ø)
cmd/ingester/app/consumer/consumer_metrics.go	100% <100%> (ø)
cmd/ingester/app/processor/decorator/retry.go	100% <100%> (ø)
cmd/ingester/app/consumer/committing_processor.go	100% <100%> (ø)
cmd/ingester/app/processor/parallel_processor.go	100% <100%> (ø)
cmd/ingester/app/consumer/message.go	100% <100%> (ø)
cmd/ingester/app/consumer/processor_factory.go	100% <100%> (ø)
... and 10 more

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[yurishkuro]

Rename mock_saramaConsumer.go to cmd/ingester/app/consumer/mock_saramaConsumer_test.go

What is this commit trying to achieve?

[vprithvi]

What is this commit trying to achieve?

I wasn't able to find a easy way to exclude a single file from a package from coverage. Renaming with a _test works here because the mock is only used from tests.

The mock is not in a separate mocks package because the consumer interface it is mocking was declared private.

[vprithvi]

Build fails because of #945