Disable exit on error during VSM create

The VSM create script assumed that any errors would be
ignored. However, the current stack.sh script will exit
on any error, thus failing to stack the very first time,
when there is no VSM to destroy.

This simple change is to disable that checking, rather
than add all sorts of tests throughout the function.
Pass MySQL user/password to csr1kv_install_all.sh

If MySQL is not set up with passwordless access to all
databases, then the MySQL commands run by scipts called
from csr1kv_install_all.sh need to use the username and
password arguments.

This takes the localrc settings for MySQL user and password
(which need to be set with values and not reference other
variables), and passes them down to csr1kv_install_all.sh.

A companion change is needed in csr1kv_install_all.sh and
associated scripts in the Neutron repo.