Issue-497: Added changes for configuring PDB

[Prabhaker24]

Signed-off-by: prabhaker24 [email protected]

Change log description

This pr helps prevent segmentstore and controller pods from evicting if number of segmentstore or controller are greater than number of nodes. By making the PDB Configurable.

Purpose of the change

Fixes #497

What the code does

Added maxUnavailableControllerReplicas and maxUnavailableSgmentStoreReplicas fields which will be used to configure the controller and ss pdb respectively.

How to verify it

Modify the above two field and check inside the controller and ss PDB's they should have the modified values.

[codecov-io]

Codecov Report

Merging #499 (96043b0) into master (298ccf8) will increase coverage by 0.01%.
The diff coverage is 63.63%.

@@            Coverage Diff             @@
##           master     #499      +/-   ##
==========================================
+ Coverage   71.62%   71.63%   +0.01%     
==========================================
  Files          15       15              
  Lines        3411     3427      +16     
==========================================
+ Hits         2443     2455      +12     
- Misses        865      869       +4     
  Partials      103      103              

Impacted Files	Coverage Δ
...roller/pravegacluster/pravegacluster_controller.go	51.37% <42.85%> (+0.17%)	⬆️
pkg/apis/pravega/v1beta1/pravega.go	97.56% <100.00%> (+0.19%)	⬆️
pkg/controller/pravega/pravega_controller.go	100.00% <100.00%> (ø)
pkg/controller/pravega/pravega_segmentstore.go	100.00% <100.00%> (ø)

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[gaddamas]

Can you post the test results?

[Prabhaker24]

Can you post the test results?

here's the link to the result for e2e test for the last commit https://github.com/pravega/pravega-operator/runs/1786620931

[anishakj]

LGTM