Description of problem (please be detailed as possible and provide log
snippets):

PVC creation using RBD storageclass where encryption is enabled using KMS fails with the following error:

I0203 10:17:38.463042       1 connection.go:183] GRPC request: {"capacity_range":{"required_bytes":2147483648},"name":"pvc-29170a51-9575-420b-af4e-d0a176ca6779","parameters":{"clusterID":"openshift-storage","encrypted":"true","encryptionKMSID":"1-vault","imageFeatures":"layering","imageFormat":"2","pool":"ocs-storagecluster-cephblockpool"},"secrets":"***stripped***","volume_capabilities":[{"AccessType":{"Mount":{"fs_type":"ext4"}},"access_mode":{"mode":1}}]}
I0203 10:17:38.475791       1 connection.go:185] GRPC response: {}
I0203 10:17:38.475821       1 connection.go:186] GRPC error: rpc error: code = InvalidArgument desc = invalid encryption kms configuration: failed to parse kms configuration: unexpected end of JSON input
I0203 10:17:38.475839       1 controller.go:752] CreateVolume failed, supports topology = false, node selected false => may reschedule = false => state = Finished: rpc error: code = InvalidArgument desc = invalid encryption kms configuration: failed to parse kms configuration: unexpected end of JSON input

Version of all relevant components (if applicable):
OCP: 4.7.0-0.nightly-2021-02-02-223803
OCS: ocs-operator.v4.7.0-250.ci

Does this issue impact your ability to continue to work with the product
(please explain in detail what is the user impact)?

Provisioning for encrypted RBD PVC fails 

Is there any workaround available to the best of your knowledge?
Not that I am aware of


Rate from 1 - 5 the complexity of the scenario you performed that caused this
bug (1 - very simple, 5 - very complex)?
2

Can this issue reproducible?
Yes

Can this issue reproduce from the UI?
Yes

If this is a regression, please provide more details to justify this:
No

Steps to Reproduce:
1. Create an RBD storageclass with encryption enabled
2. Create a secret containing the token from vault
3. Create an RBD PVC using the storageclass in step 1


Actual results:
PVC is stuck in Pending state with the following error:

I0203 10:17:38.475839       1 controller.go:752] CreateVolume failed, supports topology = false, node selected false => may reschedule = false => state = Finished: rpc error: code = InvalidArgument desc = invalid encryption kms configuration: failed to parse kms configuration: unexpected end of JSON input


Expected results:
PVC creation should be successful