ceph: Move secret key parsing earlier.

This makes the base64 logic be contained in mount option parsing,
and prepares us for replacing the homebew key management with the
kernel key retention service.

Signed-off-by: Tommi Virtanen <tommi.virtanen@dreamhost.com>
Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/include/linux/ceph/libceph.h b/include/linux/ceph/libceph.h
index 0d2e0ff..6365f04 100644
--- a/include/linux/ceph/libceph.h
+++ b/include/linux/ceph/libceph.h
@@ -61,7 +61,7 @@
 					      pointer type of args */
 	int num_mon;
 	char *name;
-	char *secret;
+	struct ceph_crypto_key *key;
 };
 
 /*