added support for new ciphers

[deepaksibm]

validate method correction

updated test case

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Relates OR Closes #0000

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...

[deepaksibm]

$ make testacc TEST=./ibm/service/vpc TESTARGS='-run=TestAccIBMISIKEPolicy_basic'
=== RUN   TestAccIBMISIKEPolicy_basic
--- PASS: TestAccIBMISIKEPolicy_basic (63.45s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     65.178s