Unity: fix fs/nfs/cifs issues

[yong-huang]

Fix filesystem, nfs share, cifs share issues:

• Incorrect response from nfs_share create() call
• Unable to remove filesystem's description

[codecov]

Codecov Report

Merging #335 (d6de654) into master (0437478) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #335   +/-   ##
=======================================
  Coverage   91.69%   91.70%           
=======================================
  Files          99       99           
  Lines       13927    13927           
  Branches     1686     1686           
=======================================
+ Hits        12771    12772    +1     
+ Misses        743      741    -2     
- Partials      413      414    +1     

Impacted Files	Coverage Δ
storops/unity/resource/cifs_share.py	88.20% <100.00%> (ø)
storops/unity/resource/filesystem.py	92.90% <100.00%> (ø)
storops/unity/resource/nfs_share.py	84.14% <100.00%> (ø)
storops/lib/common.py	93.13% <0.00%> (+0.26%)	⬆️

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