Many files:
g/c _readline{,s} and use regular readline{,s} functions -- the special
_readline{,s} functions were only needed because of Twisted.
ip.py:
Also use readlines() instead of xreadlines().
Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
ip.py:
Make the get_current_ip* functions more robust -- default to look at the
interface which is currently used for the default route instead of eth0.
Fix get_current_ipaddr, get_current_ipmask and get_current_ipgw for
veth0.
Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>