Feature/grpc and rest to use shared service layer

[ghost]

Prepare the code for being able to add audit logic in one place(service layer, rather than gRPC and rest):

• remove direct DAO invocation from gRPC
• migrate most of GRPC and REST to use an existing service layer
• remove a few places with copy-paste and dead code

Also, add an ability to run the server on a specific HOST(ie "localhost" only) for security purposes, by default it's still "broadcast"(0.0.0.0)

[codecov]

Codecov Report

Merging #900 into master will increase coverage by 0.09%.
The diff coverage is 28.18%.

@@             Coverage Diff              @@
##             master     #900      +/-   ##
============================================
+ Coverage      61.7%   61.79%   +0.09%     
- Complexity     2494     2498       +4     
============================================
  Files           214      214              
  Lines         12262    12219      -43     
  Branches       1197     1187      -10     
============================================
- Hits           7566     7551      -15     
+ Misses         4041     4013      -28     
  Partials        655      655

Impacted Files	Coverage Δ	Complexity Δ
...netflix/conductor/service/common/BulkResponse.java	0% <ø> (ø)	0 <0> (?)
...x/conductor/server/resources/WorkflowResource.java	96.77% <ø> (-0.11%)	19 <0> (ø)
...netflix/conductor/service/WorkflowBulkService.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...nductor/server/resources/WorkflowBulkResource.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...onductor/grpc/server/service/EventServiceImpl.java	13.04% <27.27%> (-3.63%)	2 <1> (ø)
...conductor/grpc/server/service/TaskServiceImpl.java	41.3% <50%> (+0.59%)	8 <2> (ø)	⬇️
...uctor/grpc/server/service/WorkflowServiceImpl.java	37.97% <54.54%> (-3.55%)	10 <5> (-1)
...ava/com/netflix/conductor/service/TaskService.java	54.41% <57.14%> (-0.28%)	12 <1> (+2)
...com/netflix/conductor/service/WorkflowService.java	91.46% <66.66%> (-1.8%)	27 <5> (+2)
...va/com/netflix/conductor/service/EventService.java	29.41% <0%> (+29.41%)	1% <0%> (+1%)	⬆️

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[coveralls]

Pull Request Test Coverage Report for Build 2135

• 33 of 110 (30.0%) changed or added relevant lines in 7 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.1%) to 67.19%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
core/src/main/java/com/netflix/conductor/service/WorkflowService.java	10	12	83.33%
core/src/main/java/com/netflix/conductor/service/TaskService.java	4	7	57.14%
grpc-server/src/main/java/com/netflix/conductor/grpc/server/service/TaskServiceImpl.java	4	8	50.0%
jersey/src/main/java/com/netflix/conductor/server/resources/WorkflowBulkResource.java	0	7	0.0%
grpc-server/src/main/java/com/netflix/conductor/grpc/server/service/EventServiceImpl.java	3	11	27.27%
grpc-server/src/main/java/com/netflix/conductor/grpc/server/service/WorkflowServiceImpl.java	12	22	54.55%
core/src/main/java/com/netflix/conductor/service/WorkflowBulkService.java	0	43	0.0%

Files with Coverage Reduction	New Missed Lines	%
jersey/src/main/java/com/netflix/conductor/server/resources/WorkflowBulkResource.java	1	0.0%

Totals
Change from base Build 2107:	0.1%
Covered Lines:	8210
Relevant Lines:	12219

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💛 - Coveralls