Makes error message easier to understand.

If the host ip address is indeterminate while executing
stack.sh, an error message is displayed.  This error message
could be a source of confusion since it references localrc,
which is depreciated.

This patch makes the error message clearer and easier to
understand.  It does this by taking out the reference to
localrc.  It also points the user towards local.conf where there
are suggestions on how to set HOST_IP.

Change-Id: I41f14a2de85449d2a08ab7eb2849844a1087b147
Closes-Bug: #1290556
Merge "Makes error message easier to understand."