Add improved SSH/Fuel web instructions

- List all the IP address on which Fuel UI is
  accessible instead of only eth0.
- Also added default username and password
  for Fuel UI, hardcoded as admin/admin
- Removes duplicate code from
  bootstrap_admin_node scripts which was
  previously causing the sed line to
  appear twice in /etc/rc.local

Closes-Bug: #1351937

Change-Id: Ib0605c298c6ef26e8cdceb07171b76cee96ae3f8
Merge "Add improved SSH/Fuel web instructions"