Fixes force merge failing on long executions, changes some action mes…

[dbbaughe]

…… (#267)

• Fixes force merge failing on long executions, changes some action messaging, adds better try/catch on actions to deal with remote transport exceptions

• Adds unit tests for failures in steps

• Adds more tests

• Updates jacoco source so the source files show up in the report

• Adds tests for wait for snapshot step

• Adds tests for attempt snapshot step and some missing license headers

• Addressing comments on naming and spacing

Issue #, if available:

Description of changes:

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Merging #269 into opendistro-1.8 will increase coverage by 3.81%.
The diff coverage is 71.30%.

@@                 Coverage Diff                  @@
##             opendistro-1.8     #269      +/-   ##
====================================================
+ Coverage             71.16%   74.98%   +3.81%     
- Complexity              617      667      +50     
====================================================
  Files                    83       83              
  Lines                  3628     3758     +130     
  Branches                600      608       +8     
====================================================
+ Hits                   2582     2818     +236     
+ Misses                  735      627     -108     
- Partials                311      313       +2     

Impacted Files	Coverage Δ	Complexity Δ
...ement/model/coordinator/SweptManagedIndexConfig.kt	86.48% <ø> (ø)	8.00 <0.00> (ø)
...dexstatemanagement/elasticapi/ElasticExtensions.kt	65.38% <20.00%> (-1.97%)	0.00 <0.00> (ø)
...nagement/step/forcemerge/AttemptSetReadOnlyStep.kt	42.50% <21.05%> (-10.28%)	4.00 <0.00> (ø)
...anagement/step/forcemerge/WaitForForceMergeStep.kt	32.05% <25.00%> (-1.29%)	5.00 <1.00> (ø)
...ement/step/notification/AttemptNotificationStep.kt	57.57% <25.00%> (-4.50%)	5.00 <0.00> (ø)
...atemanagement/step/rollover/AttemptRolloverStep.kt	54.70% <35.71%> (-2.59%)	14.00 <8.00> (ø)
...ement/step/forcemerge/AttemptCallForceMergeStep.kt	66.66% <64.70%> (+0.95%)	7.00 <1.00> (+4.00)
...exstatemanagement/step/delete/AttemptDeleteStep.kt	78.26% <77.77%> (-5.62%)	6.00 <2.00> (+2.00)	⬇️
...anagement/step/transition/AttemptTransitionStep.kt	86.76% <87.50%> (+42.69%)	12.00 <10.00> (+8.00)
.../indexstatemanagement/step/open/AttemptOpenStep.kt	86.84% <94.73%> (+33.50%)	5.00 <3.00> (+2.00)
... and 15 more

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