Update Shard status processing

[rtay1188]

Shard handler now updates the shard status while producing networking resources from it.
Added tests for some of the shard status processing methods.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 50.87719% with 56 lines in your changes missing coverage. Please review.

Project coverage is 71.48%. Comparing base (3e19061) to head (6d8cdea).
Report is 2 commits behind head on master.

Files	Patch %	Lines
admiral/pkg/clusters/shard_handler.go	50.44%	45 Missing and 11 partials ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #325      +/-   ##
==========================================
- Coverage   71.74%   71.48%   -0.26%     
==========================================
  Files          65       65              
  Lines        8723     8821      +98     
==========================================
+ Hits         6258     6306      +48     
- Misses       2147     2186      +39     
- Partials      318      329      +11     

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