UBUNTU: SAUCE: LSM stacking: LSM: Infrastructure management of the remaining blobs

UBUNTU: SAUCE: LSM stacking: LSM: Infrastructure management of the remaining blobs

Move management of the inode, ipc, key, msg_msg, sock and superblock
security blobs from the security modules to the infrastructure.
Use of the blob pointers is abstracted in the security modules.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>