[ABFS]:Extra getAcl call while calling the very first API of FileSystem

Store doesn't flow in the namespace information to the client.

In https://github.com/apache/hadoop/pull/6221, getIsNamespaceEnabled is added in client methods which checks if namespace information is there or not, and if not there, it will make getAcl call and set the field. Once the field is set, it would be used in future getIsNamespaceEnabled method calls for a given AbfsClient.

Since, CPK both global and encryptionContext are only for hns account, the fix that is proposed is that we would fail fs init if its non-hns account and cpk config is given.