I-134 Add --in-cluster key for provisioner

[rvadim]

Fixes #135

[codecov-io]

Codecov Report

Merging #135 (e262db5) into master (c5df284) will decrease coverage by 0.29%. The diff coverage is 40.00%.

@@            Coverage Diff             @@
##           master     #135      +/-   ##
==========================================
- Coverage   78.49%   78.19%   -0.30%     
==========================================
  Files          22       22              
  Lines        1432     1440       +8     
==========================================
+ Hits         1124     1126       +2     
- Misses        308      314       +6     

Impacted Files	Coverage Δ
k8s_handle/__init__.py	45.56% <40.00%> (-1.10%)	:arrow_down:

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