[stable/efs-provisioner] add support for mounting with IP

[kszalontai]

Is this a request for help?: no

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Is this a BUG REPORT or FEATURE REQUEST? (choose one): FEATURE REQUEST

Version of Helm and Kubernetes:
Helm v2.12.1
K8S v1.12.5-gke.5

Which chart:
efs-provisioner

What happened:
I'd like to mount my EFS from outside my AWS VPC, but it's only possible with the IP address see this

The chart currently supports efsFileSystemId so I can't use for the above scenario.

[garnold54]

This would also be very useful for us. It looks like the efs provisioner did add support for arbitrary DNS names which also works with IP addresses: kubernetes-retired/external-storage#422

If this chart could be extended to support that new env var then it would support IP address mounting.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Any further update will cause the issue/pull request to no longer be considered stale. Thank you for your contributions.