Increase default sighup_timeout
Increase default sighup_timeout

It seems at times it takes more time than the current default
for the child processes to exit normally. Increasing it to
120 seconds.

Change-Id: Ic54d2d7edc97cbe07ed4a4445cb865bd1b157f9d
Closes-Bug: #1607177

cwolferh/heat-scratch,cwolferh/heat-scratch,noironetworks/heat,openstack/heat,openstack/heat,noironetworks/heat