PWX-28882: Fix Nomad support issues for vSphere provider

[nrevanna]

Configmap apis were used in vSphere provider which stopped px from coming up on Nomad. The following changes are made

• Store interface moved to cloudops
• DriveSetStore interface created with Store as composite. Contains interfaces with DriveSet datastructure.
• GetLockTryDuration introduced
• Renamed GetLockTimeout/SetLockTimeout to GetLockHoldTimeout/SetLockHoldTimeout.
• Implemented IsKeyLocked() and LockWithKey() interfaces in kv_store
• Removed noOpStore implementation. It was a stop gap solution for locak of implementation in kv_store

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