move functions from ceph to ceph_manager

mount_osd_data and make_admin_daemon_dir are only used by
ceph_manager.py although they are defined in ceph.py

Signed-off-by: Loic Dachary <loic@dachary.org>
initialize ctx.manager in ceph.py

instead of rados.py because ceph.py is only run once where rados.py
could be run multiple time, leading to race conditions

http://tracker.ceph.com/issues/9027 Fixes: #9027

Signed-off-by: Loic Dachary <loic@dachary.org>
replace locally instantiated CephManager

Use the ctx.manager instance created by ceph.py instead

Signed-off-by: Loic Dachary <loic@dachary.org>
Merge pull request #89 from dachary/wip-9027-create-unique-pool

initialize ctx.manager in ceph.py

Reviewed-by: Sage Weil <sage@redhat.com>