[TA3366]Rebuild test case, hardening snap rebuild.

[satbirchhikara]

Signed-off-by: satbir [email protected]

This Unit test automation include:

1. Write data on healthy replica
2. Take snapshot S1
3. Write more data
4. Take snapshot s2
5. Rebuild a replica from Healthy replica where we have taken snapshot S1 and S2.
6. At end verify data as well as snapshot
7. Cover mesh rebuild failure case
8. Cover mesh rebuild success case

[vishnuitta]

changes are good. circleci is failing. Please have a look at it

[codecov-io]

Codecov Report

Merging #138 into zfs-0.7-release will increase coverage by 0.36%.
The diff coverage is 89.09%.

@@                Coverage Diff                 @@
##           zfs-0.7-release    #138      +/-   ##
==================================================
+ Coverage            52.04%   52.4%   +0.36%     
==================================================
  Files                  241     241              
  Lines                77546   77783     +237     
==================================================
+ Hits                 40357   40761     +404     
+ Misses               37189   37022     -167

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[vishnuitta]

changes are good