Add test for changing static ip

Vsphere, openstack and vcloud should set second static ip environment
variable. AWS is using 10.10.0.30 in static ip range and can be overwritten
in environment variable.

BATS use public_ip to ssh to nodes now, and VIP and static IP are separate
concepts.

Test is pending for dynamic network.

Signed-off-by: Adam Stegman <astegman@pivotallabs.com>