samba-tool processes: display pre-fork masters and workers

samba-tool processes: display pre-fork masters and workers

Tag prefork work processes with "(worker 0)", and sort the process list
on server name to get a consistent order.

 Service:                          PID
 --------------------------------------
 cldap_server                     15588
 ...
 ldap_server                      15584
 ldap_server(worker 0)            15627
 ldap_server(worker 1)            15630
 ldap_server(worker 2)            15632
 ldap_server(worker 3)            15634
 nbt_server                       15576
 notify-daemon                    15638
 ...
 samba                                0
 ...
 wrepl_server                     15580

Signed-off-by: Gary Lockyer <gary@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>