Fix for ram shared avmc

[pooja-choudhury]

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the library.

Changes to Security Controls

No

Description

Autonomous VM cluster creation using ARN
There are some special account called RAM shared account for which AWS API doesn't accept ids of odb network and exadata infrastructure while creating vm cluster , only supports ARN.
Note : odb network and exadata infra are only resources that can be RAM shared.
This PR enables VM cluster to accept either combination of (odb network + exadata infra id) Or (odb network + exadata infra ARN)

References

https://docs.aws.amazon.com/odb/latest/UserGuide/sharing-resources-task.html

Output from Acceptance Testing

...
consolemake testacc TESTS=TestAccODBCloudAutonomousVmCluster_usingArn PKG=odb  
...

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