functional: Fix RABBIT_PASSWORD env var
functional: Fix RABBIT_PASSWORD env var

Caller of configure_func_for_testing.sh script is able to override default
password for rabbit service. This patch replaces RABBIT_HOST as a
password to RABBIT_PASSWORD env var.

TrivialFix

Change-Id: Ie9cafc1fb75209ae1cacc58f254c1da33521d6b5

huntxu/neutron,mahak/neutron,mahak/neutron,noironetworks/neutron,openstack/neutron,openstack/neutron,huntxu/neutron,openstack/neutron,mahak/neutron,noironetworks/neutron