fix(readonly): honouring readonly flag.

[pawanpraka1]

Signed-off-by: Pawan pawan@mayadata.io

Why is this PR required? What issue does it fix?:

Readonly flag does not come as mount option, it has
separate field to mention readonly flag. ZFS-LocalPV
driver should check that field and add "ro" as mountoption.

Checklist:

• Fixes #
• PR Title follows the convention of <type>(<scope>): <subject>
• Has the change log section been updated?
• Commit has unit tests
• Commit has integration tests
• (Optional) Are upgrade changes included in this PR? If not, mention the issue/PR to track:
• (Optional) If documentation changes are required, which issue on

[codecov-commenter]

Codecov Report

Merging #137 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #137   +/-   ##
=======================================
  Coverage   22.90%   22.90%           
=======================================
  Files          14       14           
  Lines         489      489           
=======================================
  Hits          112      112           
  Misses        376      376           
  Partials        1        1           

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[kmova]

n_: misspelt feild in commit message

[pawanpraka1]

@kmova corrected the typo. Thanks.