mgr/telemetry: Add Ceph Telemetry module to send reports back to project

mgr/telemetry: Add Ceph Telemetry module to send reports back to project

This Manager Module will send statistics and version information from
a Ceph cluster back to telemetry.ceph.com if the user has opted-in on sending
this information.

Additionally a user can tell that the information is allowed to be made
public which then allows other users to see this information.

Signed-off-by: Wido den Hollander <wido@42on.com>
(cherry picked from commit 8f6137d162d2505eaefe489e16f3adffc7977cf8)

Conflicts:
	doc/mgr/index.rst
	qa/tasks/mgr/test_module_selftest.py