labs: Update Ubuntu 14.04 -> 14.04.1
labs: Update Ubuntu 14.04 -> 14.04.1

Update the ISO_URL for the new Ubuntu point release.

Change-Id: I81e70f929d0348f0f91b6381a70f6919b48983c5
Implements: blueprint openstack-training-labs

openstack/training-guides,Nabs007/training-guides,harrisonfeng/training-guides,Nabs007/training-guides,Nabs007/training-guides,harrisonfeng/training-guides,harrisonfeng/training-guides,openstack/training-guides