Adding role based filtering for rest of APIs

[saratvemulapalli]

*Issue #195 *

Description of changes:
Adding backend user role based filtering to Delete, Start/Stop, Get/Profile and Update APIs.
Also added support to block users creating detectors when AD Backend Role based filtering is turned on and user does not have backend roles.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

Merging #325 (31b4a9f) into master (f442efd) will decrease coverage by 0.76%.
The diff coverage is 45.00%.

@@             Coverage Diff              @@
##             master     #325      +/-   ##
============================================
- Coverage     74.39%   73.62%   -0.77%     
+ Complexity     2022     2020       -2     
============================================
  Files           201      201              
  Lines          9563     9664     +101     
  Branches        852      860       +8     
============================================
+ Hits           7114     7115       +1     
- Misses         2019     2116      +97     
- Partials        430      433       +3     

Flag	Coverage Δ	Complexity Δ
cli	79.27% <ø> (ø)	0.00 <ø> (ø)
plugin	73.16% <45.00%> (-0.83%)	0.00 <13.00> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ	Complexity Δ
...opendistroforelasticsearch/ad/util/ParseUtils.java	45.66% <9.25%> (-11.92%)	31.00 <3.00> (+3.00)	⬇️
...transport/IndexAnomalyDetectorTransportAction.java	72.72% <64.00%> (-3.28%)	11.00 <5.00> (+5.00)	⬇️
...d/transport/GetAnomalyDetectorTransportAction.java	55.03% <78.57%> (+2.45%)	14.00 <2.00> (+2.00)
...d/transport/AnomalyDetectorJobTransportAction.java	81.57% <80.95%> (-2.43%)	5.00 <3.00> (+2.00)	⬇️
...ransport/DeleteAnomalyDetectorTransportAction.java	21.68% <83.33%> (-34.73%)	3.00 <0.00> (-11.00)
...port/SearchAnomalyDetectorInfoTransportAction.java	54.54% <0.00%> (-9.10%)	4.00% <0.00%> (ø%)
...asticsearch/ad/cluster/ADClusterEventListener.java	88.00% <0.00%> (-4.00%)	13.00% <0.00%> (-1.00%)
.../handler/IndexAnomalyDetectorJobActionHandler.java	10.84% <0.00%> (-0.61%)	3.00% <0.00%> (-1.00%)
...sticsearch/ad/indices/AnomalyDetectionIndices.java	49.01% <0.00%> (-0.33%)	39.00% <0.00%> (-1.00%)

[yizheliu-amazon]

thanks for the change