Fixes lp#1634770: openstack bootstrap panics with identity endpoint without version.
Fixes lp#1634770: openstack bootstrap panics with identity endpoint without version.

anastasiamac/juju,ericsnowcurrently/juju,mikemccracken/juju,anastasiamac/juju,waigani/juju,bac/juju,frankban/juju,frankban/juju,anastasiamac/juju,bac/juju,reedobrien/juju,bac/juju,mjs/juju,mikemccracken/juju,reedobrien/juju,AdamIsrael/juju,mjs/juju,anastasiamac/juju,reedobrien/juju,marcmolla/juju,marcmolla/juju,frankban/juju,mjs/juju,bac/juju,AdamIsrael/juju,AdamIsrael/juju,ericsnowcurrently/juju,mjs/juju,mikemccracken/juju,waigani/juju,marcmolla/juju,frankban/juju,waigani/juju,alesstimec/juju,alesstimec/juju,ericsnowcurrently/juju,waigani/juju,frankban/juju,alesstimec/juju,mikemccracken/juju,marcmolla/juju,ericsnowcurrently/juju,mjs/juju,mjs/juju,anastasiamac/juju,alesstimec/juju,marcmolla/juju,reedobrien/juju,mjs/juju,ericsnowcurrently/juju,AdamIsrael/juju,bac/juju,alesstimec/juju,reedobrien/juju,mikemccracken/juju