ceph: send the fscrypt_file to client in cap update messages

This should be squashed to one of the previous commit later.

Signed-off-by: Xiubo Li <xiubli@redhat.com>

src/mds/CInode.cc

@@ -4139,6 +4139,7 @@ void CInode::encode_cap_message(const ref_t<MClientCaps> &m, Capability *cap)
   m->size = i->size;
   m->truncate_seq = i->truncate_seq;
   m->truncate_size = i->truncate_size;
+  m->fscrypt_file = pi->fscrypt_file;
   m->mtime = i->mtime;
   m->atime = i->atime;
   m->ctime = i->ctime;