Fixed metric_index causes ValueError in ip_lib

[Arata Notsu]

ip_lib.IpRouteCommand.get_gateway() raises ValueError to default_route_line like

default via 192.168.99.1 proto static

since it wrongly assumes that the 5th word is a value metric (in the example above, it is "static").

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/65917

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/65917
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=5b5ba869aa4680bcfa7544c4e718cb5a5dc9c168
Submitter: Jenkins
Branch: master

commit 5b5ba869aa4680bcfa7544c4e718cb5a5dc9c168
Author: Arata Notsu <email address hidden>
Date: Fri Jan 10 19:54:10 2014 +0900

    Fix ValueError in ip_lib.IpRouteCommand.get_gateway()

    As metric is not necessarily the 5th word of the gateway line, the
    method should search the string 'metric' in the line and pick the next
    word as the metric value.

    Change-Id: I2663ddbae82f80b912b364c07f9ab92c5b90b718
    Closes-Bug: #1267790