tools: Fix ovirt-engine-notifier logging config

Fixes ovirt-engine-noitifier logging config under JBoss EAP. The problem
started when JBoss EAP reimplemented log4j classes in JBoss Log Manager,
but logging configuration initialization from system property
log4j.configuration has not been included in those reimplemented
classes. This patch initializes log4j configuration for
ovirt-engine-notifier.

Change-Id: Iad46dc04853e87e280c2f60100a041d781809eb8
Bug-Url: https://bugzilla.redhat.com/948744
Signed-off-by: Martin Perina <mperina@redhat.com>