Adding haystack opencensus integration

[ashishagg]

No description provided.

[codecov-io]

Codecov Report

Merging #72 into master will increase coverage by 4.55%.
The diff coverage is 85.29%.

@@             Coverage Diff              @@
##             master      #72      +/-   ##
============================================
+ Coverage      59.8%   64.35%   +4.55%     
- Complexity      215      228      +13     
============================================
  Files            49       46       -3     
  Lines          1204     1139      -65     
  Branches         96       98       +2     
============================================
+ Hits            720      733      +13     
+ Misses          446      363      -83     
- Partials         38       43       +5

Impacted Files	Coverage Δ	Complexity Δ
...stack/client/dispatchers/clients/LoggerClient.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...k/dropwizard/configuration/AgentClientFactory.java	30% <ø> (ø)	3 <0> (ø)	⬇️
.../dropwizard/configuration/LoggerClientFactory.java	30% <ø> (ø)	1 <0> (ø)	⬇️
...ck/dropwizard/configuration/NoopClientFactory.java	75% <ø> (ø)	1 <0> (ø)	⬇️
...ack/client/dispatchers/clients/InMemoryClient.java	89.13% <ø> (ø)	8 <0> (ø)	⬇️
...aystack/client/dispatchers/clients/NoopClient.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...n/java/com/expedia/www/haystack/client/Tracer.java	77.3% <0%> (-0.97%)	13 <0> (ø)
...porter/trace/config/GrpcAgentDispatcherConfig.java	100% <100%> (ø)	5 <5> (?)
...lient/dispatchers/clients/HttpCollectorClient.java	50% <40%> (-25.61%)	2 <1> (-8)
...ck/client/dispatchers/clients/GRPCAgentClient.java	53.84% <55.55%> (+9.4%)	2 <1> (-2)	⬇️
... and 9 more

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