Refactoring: remove old OC Collector code

[pjanotti]

Initial phase of removal of old OC code that is still present on the repo.

• Renamed and moved collector package to application
• Deleted the ./cmd/occollector/ folder (and related Makefile target)
• Removed some dead code from package builder (there is still more to be deleted, but I had to choose a cut point for this PR)
• Moved Jaeger sender/ to exporter/ in preparation to implement issue Add Jaeger exporter factory #136 (Add Jaeger Exporter Factory)

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@34ca12f). Click here to learn what that means.
The diff coverage is 0%.

@@            Coverage Diff            @@
##             master     #149   +/-   ##
=========================================
  Coverage          ?   73.05%           
=========================================
  Files             ?       95           
  Lines             ?     5789           
  Branches          ?        0           
=========================================
  Hits              ?     4229           
  Misses            ?     1350           
  Partials          ?      210

Impacted Files	Coverage Δ
service/telemetry.go	72.97% <ø> (ø)
service/healthcheck.go	100% <ø> (ø)
service/builder/sampling_builder.go	76.08% <ø> (ø)
...er/jaegerexporter/jaeger_thrift_tchannel_sender.go	0% <ø> (ø)
...porter/jaegerexporter/jaeger_thrift_http_sender.go	0% <ø> (ø)
receiver/zipkinreceiver/trace_receiver.go	56.22% <ø> (ø)
service/builder/processor_builder.go	87.3% <ø> (ø)
service/builder/pipelines_builder.go	92.72% <ø> (ø)
...xporter/jaegerexporter/jaeger_proto_grpc_sender.go	0% <ø> (ø)
service/logger.go	80% <ø> (ø)
... and 4 more

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[tigrannajaryan]

LGTM with minor comment.