Add Hypervisor default as cache mode for disk offerings

[hsato03]

Description

Currently, ACS provides none, write-back and write-through options as cache mode when creating disk offerings.

This PR adds the option Hypervisor default as an alternative to cache mode. By using this option, the KVM hypervisor will choose the cache mode to be used by the disk.

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

Screenshots (if appropriate):

Disk offering creation

Compute offering with compute only disk offering creation

How Has This Been Tested?

1. I created a disk offering and a compute offering with compute only disk offering using the Hypervisor default as cache mode;
2. I deployed a VM for each offering from step 1;
3. I verified through virt-manager that the disk of both VMs was using the Hypervisor default cache mode, as in the screenshot below.

[hsato03]

@blueorangutan package

[blueorangutan]

@hsato03 a [SL] Jenkins job has been kicked to build packages. It will be bundled with KVM, XenServer and VMware SystemVM templates. I'll keep you posted as I make progress.

[codecov]

Codecov Report

Attention: Patch coverage is 10.00000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 16.02%. Comparing base (2654890) to head (5178bad).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...g/apache/cloudstack/storage/to/VolumeObjectTO.java	0.00%	4 Missing ⚠️
...datastore/adapter/ProviderAdapterDiskOffering.java	0.00%	4 Missing ⚠️
...src/main/java/com/cloud/offering/DiskOffering.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main   #10282   +/-   ##
=========================================
  Coverage     16.02%   16.02%           
+ Complexity    13149    13147    -2     
=========================================
  Files          5658     5658           
  Lines        496312   496317    +5     
  Branches      60109    60110    +1     
=========================================
+ Hits          79536    79537    +1     
- Misses       407927   407931    +4     
  Partials       8849     8849           

Flag	Coverage Δ
uitests	4.01% <ø> (ø)
unittests	16.86% <10.00%> (+<0.01%)	⬆️

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[blueorangutan]

Packaging result [SF]: ✔️ el8 ✔️ el9 ✔️ debian ✔️ suse15. SL-JID 12225

[github-actions]

This pull request has merge conflicts. Dear author, please fix the conflicts and sync your branch with the base branch.