Add more CI tests

[dsharma-dc]

Describe the problem/challenge you have
We need to increase the CI tests coverage scenario.

Describe the solution you'd like
Add more tests to be run via CI testing script.

Anything else you would like to add:
We'll be initially covering scenarios like thinpool extension, snapshots, vgpattern, and add more as and when we keep discovering more scenarios.

Environment:

• LVM Driver version
• Kubernetes version (use kubectl version):
• Kubernetes installer & version:
• Cloud provider or hardware configuration:
• OS (e.g. from /etc/os-release):

[dsharma-dc]

Current PRs created:
PR #308
PR #309
PR #310

[dsharma-dc]

PR #315

[dsharma-dc]

PR #320

[abhilashshetty04]

PR #323

[avishnu]

Closing this as completed.