schema and test fix for instance group manager action

[deepaksibm]

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Relates OR Closes #0000

Output from acceptance testing:

$ make testacc TEST=./ibm TESTARGS='-run=TestAccIBMISInstanceGroupManagerAction_basic_autoscale'
=== RUN   TestAccIBMISInstanceGroupManagerAction_basic_autoscale
--- PASS: TestAccIBMISInstanceGroupManagerAction_basic_autoscale (305.20s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm 307.856s

$ make testacc TEST=./ibm TESTARGS='-run=TestAccIBMISInstanceGroupManagerAction_basic'
=== RUN   TestAccIBMISInstanceGroupManagerAction_basic
--- PASS: TestAccIBMISInstanceGroupManagerAction_basic (287.46s)
=== RUN   TestAccIBMISInstanceGroupManagerAction_basic_autoscale
--- PASS: TestAccIBMISInstanceGroupManagerAction_basic_autoscale (306.13s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm 596.471s

...

[kavya498]

@deepaksibm , Kindly rebase PR..
Thanks

[deepaksibm]

@deepaksibm , Kindly rebase PR.. Thanks

@kavya498 Have rebased the PR. Thanks for notifying.