Ignore cover directory which is generated by karma coverageReporter
Ignore cover directory which is generated by karma coverageReporter

Change-Id: I37e85ac3b3d10bcb2da65578002e423ac063ffab

openstack/senlin-dashboard,stackforge/senlin-dashboard,openstack/senlin-dashboard,stackforge/senlin-dashboard,openstack/senlin-dashboard,stackforge/senlin-dashboard,openstack/senlin-dashboard