Getting Started: Fix IP address determination on F17
Getting Started: Fix IP address determination on F17

The format of the output of ifconfig has changed between Fedora 16 and
Fedora 17, so starting the metadata server failed on the latter due to a
missing IP address.

The change makes the script work with either format, and also now fails
with an error if it breaks again.

Change-Id: I7012af7bd7c15f6a962d19e66c8a0d8401243895
Signed-off-by: Zane Bitter <1899fff8e7db19a598ee9d835aa1a232f82ea264@redhat.com>

rh-s/heat,jasondunsmore/heat,ntt-sic/heat,Triv90/Heat,rdo-management/heat,dragorosson/heat,srznew/heat,miguelgrinberg/heat,JioCloud/heat,NeCTAR-RC/heat,citrix-openstack-build/heat,rickerc/heat_audit,dims/heat,jasondunsmore/heat,varunarya10/heat,pratikmallya/heat,Triv90/Heat,pratikmallya/heat,redhat-openstack/heat,rh-s/heat,JioCloud/heat,miguelgrinberg/heat,dims/heat,dragorosson/heat,noironetworks/heat,openstack/heat,steveb/heat,redhat-openstack/heat,gonzolino/heat,takeshineshiro/heat,cryptickp/heat,cwolferh/heat-scratch,maestro-hybrid-cloud/heat,openstack/heat,rdo-management/heat,ntt-sic/heat,rickerc/heat_audit,varunarya10/heat,noironetworks/heat,cryptickp/heat,Triv90/Heat,srznew/heat,citrix-openstack-build/heat,NeCTAR-RC/heat,steveb/heat,takeshineshiro/heat,maestro-hybrid-cloud/heat,gonzolino/heat,cwolferh/heat-scratch,pshchelo/heat,pshchelo/heat