Backend.java: Adding RPM version on initialization

This patch will print the oVirt Engine version on initialization.

Change-Id: I517ffcc548f84e3ca55614266f944bf87ecd5fb0
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=969819
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>