packaging: refactored firewalld support

Added one service configuration template file for each service
that should be allowed by firewalld under
/usr/share/ovirt-engine/firewalld/*.

During firewalld configuration the template files will be processed
by processTemplate with provided ports.
Then the service files will be copied to /etc/firewalld/services
and enabled for the active zones.

The ovirt-aio service will be enabled only if the plugin is installed and
enabled.

Change-Id: If6a60e1667182f926f399e22bbfbb939e7171cb0
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>
core: re-support broken apache proxy

apache proxy support was broken in:
I37156061cbdd, 'core: i18n splash screen.'

The changed cause invalid redirection and the following error message in
console log:
---
Exception while dispatching incoming RPC call:
java.lang.SecurityException: Blocked request without GWT base path
header (XSRF attack?)
---

Content:

1. Remove unused ovirt-engine.html (what was index.html) as it is
   superseded by index.jsp

2. Remove redundant welcome directive from web.xml

3. Rename /index.jsp to /ovirt-engine.jsp to be referenced by both
   apache and jboss.

4. Rename servlet mapping of /index to /ovirt-engine.

5. Modify 404.html pages to redirect to /ovirt-engine instead of
   /ovirt-engine.html

6. Remove reference of ovirt-engine.html from the proxy.

Change-Id: I7ac8feb720d73f0b1107b0bf0908930c525ea542
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>
packaging: engine-setup re-write using otopi

Change-Id: I4d5e3ac7927802326e324c9b98ada75b421638aa
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>
Signed-off-by: Alex Lourie <alourie@redhat.com>