ensure /usr/local/bin in in path
ensure /usr/local/bin in in path

osc is typicaly installed in /usr/local/bin
to avoid command not found errors when invoking osc
in devstack ensure that /usr/local/bin is included
in the PATH.

Change-Id: I605fbc4b131149bf5d1b6307b360fe365c680b1a

openstack-dev/devstack,openstack-dev/devstack,nawawi/openstack,nawawi/openstack