oo-install: fix running from /tmp

When you run oo-install as a curl-to-file, it unpacks itself into /tmp
to run. This change enables that to run successfully when /tmp is
noexec.
install: handle httpd conf for allin1

The node httpd config obscures the broker if they're installed together.
The openshift.sh handled this already for the mod-rewrite frontend, but
not for the vhost frontend. Now it does either way.