Change current directory to /
Change current directory to /

This avoids some annoying errors from postgresql tools.

hayderimran7/openstack-quickstart,SUSE-Cloud/openstack-quickstart,sjamgade/openstack-quickstart,toabctl/openstack-quickstart,sayalilunkad/openstack-quickstart,vuntz/openstack-quickstart,wenhuizhang/openstack-quickstart