Storage Filesystem as a First Class Feature

[abh1sar]

Description

This PR implements Storage filesystem as a first class feature. https://cwiki.apache.org/confluence/display/CLOUDSTACK/Storage+Filesystem+as+a+First+Class+Feature

Documentation PR: https://github.com/apache/cloudstack-documentation/pull/420

Types of changes

• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] 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

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

• [x] Major
• [ ] Minor

Bug Severity

• [ ] BLOCKER
• [ ] Critical
• [ ] Major
• [ ] Minor
• [ ] Trivial

Screenshots (if appropriate):

How Has This Been Tested?

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