populate local-ipv4 address in config drive

Currently the ec2 metadata in config drive does not include the
local-ipv4 address, because the address is not passed in when using
config drive.

This change uses the fixed_ips in network_info to populate the address
if the address was not passed in.

Fixes bug 1221664
Change-Id: I1b289bbbd7ebe103342909079d2488cf1dfbf472
Merge "populate local-ipv4 address in config drive"