add async complete option to tasks EVENT and HTTP

[milongapau]

No description provided.

[codecov]

Codecov Report

Merging #1125 into master will increase coverage by <.01%.
The diff coverage is 85.71%.

@@             Coverage Diff              @@
##             master    #1125      +/-   ##
============================================
+ Coverage     63.11%   63.12%   +<.01%     
- Complexity     2642     2647       +5     
============================================
  Files           233      233              
  Lines         13218    13243      +25     
  Branches       1323     1328       +5     
============================================
+ Hits           8343     8359      +16     
- Misses         4153     4159       +6     
- Partials        722      725       +3

Impacted Files	Coverage Δ	Complexity Δ
.../com/netflix/conductor/contribs/http/HttpTask.java	64.74% <100%> (+0.45%)	18 <0> (+1)	⬆️
...nductor/core/execution/mapper/EventTaskMapper.java	100% <100%> (ø)	3 <0> (ø)	⬇️
...onductor/core/execution/mapper/HTTPTaskMapper.java	100% <100%> (ø)	5 <0> (ø)	⬇️
.../netflix/conductor/core/execution/tasks/Event.java	88.13% <100%> (+0.63%)	12 <1> (+1)	⬆️
...om/netflix/conductor/grpc/AbstractProtoMapper.java	39.06% <66.66%> (+0.09%)	54 <0> (ø)	⬇️
...nductor/common/metadata/workflow/WorkflowTask.java	68.51% <71.42%> (+0.08%)	86 <2> (+2)	⬆️
...uctor/core/execution/tasks/WorkflowSystemTask.java	75% <75%> (ø)	10 <2> (+2)	⬆️
.../java/com/netflix/conductor/service/Lifecycle.java	30% <0%> (-30%)	2% <0%> (-1%)
.../com/netflix/conductor/grpc/server/GRPCServer.java	78.57% <0%> (-14.29%)	4% <0%> (ø)

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[coveralls]

Pull Request Test Coverage Report for Build 2609

• 27 of 28 (96.43%) changed or added relevant lines in 7 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.05%) to 69.066%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
common/src/main/java/com/netflix/conductor/common/metadata/workflow/WorkflowTask.java	6	7	85.71%

Totals
Change from base Build 2594:	0.05%
Covered Lines:	9357
Relevant Lines:	13548

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💛 - Coveralls