Add test for recovery

[hossainemruz]

This PR add some tests for recovery that simulate following steps:

1. Take backup of workload.
2. Recover data in another volume.
3. Mount the recovered volume in workload and re-deploy it.
4. Check if newly deployed workload has same data as before.

Task to do:

• Add test for deployment
• Add test for daemonset
• Add test for rc
• Add test for rs
• Add test for statefulset
• Update doc for repository

[codecov-io]

Codecov Report

Merging #409 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #409   +/-   ##
=======================================
  Coverage   84.61%   84.61%           
=======================================
  Files           1        1           
  Lines          13       13           
=======================================
  Hits           11       11           
  Misses          1        1           
  Partials        1        1

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[tamalsaha]

#392

[tamalsaha]

This is not right.

[hossainemruz]

• Remove repetition of Repository name logic
• Use repositories of workload's only instead of listing all repository (reason: parallel test problem)
• Don't use WithTransform() function to extract pod
• Check recovery for multiple file groups