chore(refactor): refactor scheduler for ZFS-LocalPV

[pawanpraka1]

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

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

refactor scheduler for ZFS-LocalPV

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 https://github.com/openebs/openebs-docs is used to track them:

[codecov-io]

Codecov Report

Merging #249 (cabae9e) into master (30a7f23) will increase coverage by 0.22%.
The diff coverage is 0.00%.

@@            Coverage Diff            @@
##           master    #249      +/-   ##
=========================================
+ Coverage    8.27%   8.50%   +0.22%     
=========================================
  Files          20      20              
  Lines        1076    1047      -29     
=========================================
  Hits           89      89              
+ Misses        986     957      -29     
  Partials        1       1              

Impacted Files	Coverage Δ
pkg/driver/controller.go	0.82% <0.00%> (-0.01%)	⬇️
pkg/driver/schd_helper.go	0.00% <0.00%> (ø)

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