[Bug Fix] Fix vm shutdown name change, fix VOD bug

[Alexander-Kita]

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Description:

• Fixes bug where pi_instance hangs when name is updated while instance is shutdown
• Fixes null pointer exception when updating virtual optic device
• Adds new wait for update function, waits for both shutdown and active status, used when name/VOD is updated and when memory/cores are updated.

Output from acceptance testing:

pi_instance (r)

=== RUN   TestAccIBMPIInstanceBasic
--- PASS: TestAccIBMPIInstanceBasic (593.46s)
PASS

=== RUN   TestAccIBMPIInstanceUpdateActiveState
--- PASS: TestAccIBMPIInstanceUpdateActiveState (1498.25s)
PASS

=== RUN   TestAccIBMPIInstanceUpdateStoppedState
--- PASS: TestAccIBMPIInstanceUpdateStoppedState (2648.59s)
PASS

[Alexander-Kita]

Opened IBM-Cloud#5881