pylib: rocks config host interface

when the private interface is not the first available interface
rocks config host interface call swap host interface to set the private
interface on the correct NIC.

Since config host interface was invoking swap interface using double quote
" in its arguments, e.g. 'ifaces="eth0,eth1"', this was confusing swap
host interface which ended up using '"eth0' and 'eth1"' as the two
interface names
fail2ban: it was missing python-inotify