ocm: Check for ID provider match as well when creating shares

[ishank011]

When creating OCM shares, we need to take both the user ID as well as the provider ID as input, as the same user ID can be present across mesh providers, but the combination of the provider ID and user ID would be unique. I changed the logic for the JSON driver, but for ldap, there's a comment that says this is screaming for errors if filter contains >1 %s, tracked in #326. So that needs to be corrected.

[labkode]

@ishank011 for OCM shares, you need to take as userID whatever is given by sharer OCM service when forwarding the invitation. The IdP and UserID sent by the remote OCM provider does not neccesary needs to exist on the receiving part, indeed, that will be the normal case.

[ishank011]

@labkode Okay so are we sure that a user's ID, as provided by the sharer OCM service, would be unique across all the providers?

[labkode]

@ishank011 I got your question. You're right, the user id provided by the original sharer is only unique inside that system, for us, to be unique we need take in consideration the provider.