mod_admin_shell: Allow matching on host or bare JID in c2s:show
Only supporting exact match on full JID isn't helpful if you want to
list sessions per host or user.
Backport of 430333198e4c
Fixes #1857
For full information on our dependencies, version requirements, and
where to find them, see https://prosody.im/doc/depends
If you have luarocks available on your platform, install the following:
- luaexpat
- luasocket
- luafilesystem
- luasec