orchestra/remote.py: check underlying Transport also
orchestra/remote.py: check underlying Transport also

if the underlying Transport object is not available, consider this
remote is not online yet.

Signed-off-by: Kefu Chai <a4b264ee037c625052534d60505bfd0db4776ac4@redhat.com>

SUSE/teuthology,dmick/teuthology,ktdreyer/teuthology,ktdreyer/teuthology,SUSE/teuthology,ceph/teuthology,dmick/teuthology,ceph/teuthology,SUSE/teuthology,dmick/teuthology