Migrate from setup-env to refresh-env.

setup-env is also used to refresh, and we want to make that clearer in
the tripleo-cd element.

Change-Id: Ib253d17e9632c318a0f1cd22cc316d4e41ccd125
Enable the kexec deployment element for devtest.

This makes deployment faster by a POST - not so big a deal for VM's
but definitely for real machines.

Change-Id: I7f25c6dfa0f5d97f0be407edd93270b26810342f