placement target patch support

[deepaksibm]

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Relates OR Closes #0000

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...

[hkantare]

Can you share the testcases results

[deepaksibm]

Can you share the testcases results

$ make testacc TEST=./ibm/service/vpc TESTARGS='-run=TestAccIBMISInstance_Placement'
=== RUN   TestAccIBMISInstance_Placement
no message sent
no message sent
no message sent
no message sent
--- PASS: TestAccIBMISInstance_Placement (308.86s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     310.567s

[hkantare]

Remove Forcenew from doc on this changed arguments