oo-install: avoid needing executable install scripts

This both simplifies the command and works with /tmp under noexec.
oo-install: improve question wording

At least one user was confused by the initial question about already
having a running broker. Tried to make this a little more obvious as
it's disorienting to a novice.
oo-install: do not restart_services needlessly [enterprise]

openshift.sh automatically restarts services after configuration, so
there is no need for oo-install to explicitly direct it to do so.