findbugs: class overrides equals, but does not override hashCode

findbugs reason:
HE: Class defines equals() and uses Object.hashCode() (HE_EQUALS_USE_HASHCODE)

Change-Id: I3e276cc87bdfd68e657a8217207dc2518ab96f34
Signed-off-by: Shahar Havivi <shavivi@redhat.com>