Adding Zone, Project and Host machine as Servers attributes

[aryantaheri]

Having a similar set of attributes as those in euca-describe-instances command's output is quite useful.

e.g.

euca-describe-instances

RESERVATION r-4sq6z15s myproj default
INSTANCE i-00000018 ami-00000002 192.168.0.12 192.168.0.12 running $KEYNAME ($PROJECT_NAME, $HOST) 0

or like nova-manage output:

nova-manage vm list

instance node type state launched image kernel ramdisk project user zone index
server-12 $HOST m1.small active 2011-10-12 08:54:08 2 1 $PROJECT_NAME novaadmin $ZONE 0