.travis.yml: Fix PPA URL location

Fix the broken Travis build to point the PPA location
to the correct new trusty distribution.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
Merge pull request #135 from autotest/fix-travis

.travis.yml: Fix PPA URL location
nic_hotplug: should boot guest without nic before hot-plug

1. nic_hotplug.cfg:
Have already updated the 'additional' and 'migration' part of nic_hotplug.cfg.

2. multi_nics_hotplug.cfg:
Update the single nic part.

Signed-off-by: Cong Li <coli@redhat.com>