test if provided ip is valid
test if provided ip is valid

Change-Id: I648f8a6a25fbc672885b58ea914fc04b3253809e

justenwalker/containerpilot,flyinprogrammer/containerpilot,benoittoulme/containerpilot,flyinprogrammer/containerpilot,justenwalker/containerbuddy,joyent/containerpilot,justenwalker/containerpilot,justenwalker/containerbuddy,joyent/containerpilot,joyent/containerpilot,joyent/containerbuddy,tgross/containerbuddy,benoittoulme/containerpilot,tgross/containerbuddy,joyent/containerbuddy,benoittoulme/containerpilot