switching shell for installer.sh to BASH to support 'if [['
switching shell for installer.sh to BASH to support 'if [['

rackerlabs/openstack-guest-agents-unix,rackerlabs/openstack-guest-agents-unix,rackerlabs/openstack-guest-agents-unix,joejulian/openstack-guest-agents-unix,joejulian/openstack-guest-agents-unix,joejulian/openstack-guest-agents-unix