Adding storageclass support for openshift and externalizing multus path for openshift (may be different)

[kalranitin]

Description

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• [x] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes if appropriate.
• [x] All new and existing tests passed.

[welcome[bot]]

:tada: Thanks for opening this pull request! We really appreciate contributors like you! :raised_hands:

[kalranitin]

More enhancements added for openshift