Add tips about using extra repositories in make help

Change-Id: Ifda02a172c72c601c9cb5083586f2b06303986f9
Closes-Bug: #1361620
iso/module.mk: don't hard-code Ubuntu version

Use the UBUNTU_RELEASE variable instead.

Change-Id: Ib332b39711cd21864e5ff9ee08cf9d7bf17c9768
Use cluster VIP instead of controller IP in test 'Deploy Heat HA'

In the system test 'Deploy Heat HA' controller IP was used to connect 
to keystone, in this case, in HA mode, need to use cluster VIP 
instead of internal controller IP to successfully connection to keystone.

Closes-Bug: #1369412

Change-Id: I8ce6f9094396a8b203aa9fe8c4b05bd8675199e1
Use cluster VIP instead of controller IP

Change-Id: I3bc1dcfd6078c6c339d71055b1d9a9914b8f7696
Closes-bug: #1369948
Merge "Use cluster VIP instead of controller IP"
Merge "Use cluster VIP instead of controller IP in test 'Deploy Heat HA'"
Merge "iso/module.mk: don't hard-code Ubuntu version"
Merge "Add tips about using extra repositories in make help"