Dcnm image upgrade v2

[allenrobel]

Summary

This PR aligns dcnm_image_upgrade with the v2 support libraries.

• Limits dependency on AnsibleModule to main() in dcnm_image_upgrade.py.
• Leverages RestSend() and the abstract class Sender() in sender_dcnm.py and sender_file.py
• Leverages Results() for outputting user results.
• Leverages MergeDicts(), ParamsMergeDefaults(), ParamsValidate() for input validation.
• Leverage Log() for standard Python logging, enabled via ENV variable.

branch

dcnm_image_upgrade_v2 created off of branch dcnm_image_policy_v2.

Changes

1. dcnm_image_upgrade.py
   • Refactored into classes Common(), Merged(), Deleted(), Query()
2. ImagePolicyAction(): replaced with:
   • ImagePolicyAttach()
   • ImagePolicyDetach()
     3. Following are updated to align with v2 support classes
        • ImageStage()
        • ImageValidate()
        • ImageUpgrade()
        • InstallOptions()
        • SwitchIssuDetails() and its subclasses
     4. WaitForControllerDone() new class. Wait for actions to complete on the controller.
     5. UT: All unit tests rewritten and renumbered.
     6. IT: Tests modularized for shorter run times.