Ignore errors updating the router status

We want the router status to be correct, but we don't want a failure to
update the status to cause other issues within the RUG. Log and discard
any exceptions that come from talking to the neutron API extension for
updating the router status.

Change-Id: I47e34a31b783e3c41f227deb48607947eb505456
Merge pull request #149 from dhellmann/robust-router-status-update

Ignore errors updating the router status