kms: Add basic GetSecret() test
kms: Add basic GetSecret() test

Add rudimentary test to ensure that we can get a valid passphrase from
the GetSecret() feature

Signed-off-by: Marcel Lauhoff <71ffe8e889bf8a669a25bf46f8e88e7fab585e83@suse.com>

ceph/ceph-csi,ceph/ceph-csi,ceph/ceph-csi,ceph/ceph-csi