cephadm: add RGW SSL support

cephadm: add RGW SSL support

This patch adds SSL support to RGW when using cephadm.
If an SSL certificate is provided, inside the json supplied with:

  cpeh orchestrator rgw create -i rgw.json

Then the SSL cert and/or key will be added to pushed into the mon config-key database
using the key `rgw/cert/<rgw_realm>/<rgw_zone>.[crt|key]`.
Which will then be referenced in the config:

  rgw_frontends = beast port=80 ssl_port=443 ssl_certificate=config://rgw/cert/<rgw_realm>/<rgw_zone>.crt

And if an ssl key is also supplied this becomes something like:

  rgw_frontends = beast port=80 ssl_port=443 ssl_certificate=config://rgw/cert/<rgw_realm>/<rgw_zone>.crt ssl_key=config://rgw/cert/<rgw_realm>/<rgw_zone>.key

Of course you could also just upload the cert and key yourself to
config-key location, and ssl will be enabled as well. But this patch
let's you either supply them via `-i` or as a manual upload step.

Co-Authored-By: Michael Fritch <mfritch@suse.com>
Co-Authored-By: Sebastian Wagner <sebastian@spawnhost.de>
Signed-off-by: Matthew Oliver <moliver@suse.com>