ceph: mon destroy: remove from mon_host

ceph: mon destroy: remove from mon_host

we need to remove an ip, ip:port or a ipvector from monhost
so use multiple regex search and replaces for this

this looks not really nice, but due to the strange format
of the line (e.g. ',' is a seperator inside and outside of a vector,
also ipv6 adresses may be surrounded with [] but so are vectors),
i found no better way

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>