misc.wait_until_osds_up: prolong the timeout from 5 min to 9 min
misc.wait_until_osds_up: prolong the timeout from 5 min to 9 min

if an node hosts 6 OSDs, it would take longer to boot. this addresses
the failure of
/a/kchai-2017-11-03_05:56:44-rados-wip-jewel-backports-reloaded-distro-basic-mira/1806380.

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

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