Add signal handling to service launcher
Add signal handling to service launcher

Part of blueprint service-infrastructure

Change-Id: Iff072199ebd3c1abcb4218c9b647f8bef75f934a
Signed-off-by: Angus Salkeld <86b65304d27d8de73dd7d624c33df7e088f8d94b@redhat.com>

JioCloud/oslo-incubator,JioCloud/oslo-incubator,JioCloud/oslo-incubator