Create volume on a specified storage pool

[abh1sar]

Description

This PR adds support for creating volume on the specified storage pool in the Ready state.
This can be done without attaching the volume to any instance. This can be helpful with vmware2kvm scenarios.

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)
• Build/CI
• Test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

• Major
• Minor

Bug Severity

• BLOCKER
• Critical
• Major
• Minor
• Trivial

Screenshots (if appropriate):

How Has This Been Tested?

Created volume using the storageid parameter on an NFS storage pool.
Verified that volume was in Ready state with a qcow2 file created with the specified virtual size.

How did you try to break this feature and the system with this change?

[codecov]

Codecov Report

❌ Patch coverage is 12.50000% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 18.00%. Comparing base (59b6c32) to head (30ee7e2).
⚠️ Report is 3 commits behind head on 4.22.

Files with missing lines	Patch %	Lines
...n/java/com/cloud/storage/VolumeApiServiceImpl.java	18.18%	9 Missing ⚠️
...stack/api/command/user/volume/CreateVolumeCmd.java	0.00%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               4.22   #12966      +/-   ##
============================================
+ Coverage     17.60%   18.00%   +0.39%     
- Complexity    15676    16463     +787     
============================================
  Files          5918     5977      +59     
  Lines        531667   537742    +6075     
  Branches      65001    66028    +1027     
============================================
+ Hits          93617    96834    +3217     
- Misses       427491   429990    +2499     
- Partials      10559    10918     +359     

Flag	Coverage Δ
uitests	3.52% <ø> (-0.18%)	⬇️
unittests	19.17% <12.50%> (+0.49%)	⬆️

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[sureshanaparti]

clgtm