packaging: services: ovirt-engine: move deployments to tmpdir

the deployments' content is controlled by ENGINE_APPS, we should run
these applications and only these.

much easier to re-create on every startup than syncing with existing.

this removes the need to remove markers, sync symlinks and other tasks.

I failed to make jboss substitute system property within the
configuration and within the paths configuration, so I use template
substitution.

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1059480
Change-Id: I17e7bc91229e9b05e6fb719a9c15c1036a3ba19b
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>