CI: restore travis notifications, IRC this time around

While quarterback [dash] devel [at] lists [dot] fedorahosted [dot] org,
original notification target and development ML seems long gone (without
archives preserved!), let's use #clusterlabs-dev at freenode IRC
network. This is in-line with the purpose of the channel and it's what
clufter, crmsh and hawk seem to be currently using.