Display unaccounted time in "DevStack Component Timing"
Display unaccounted time in "DevStack Component Timing"

In the "DevStack Component Timing" section, display the unaccounted
time.

Also add the units (seconds) to the output to make it clear to viewers.

Change-Id: Iaca82cc54a355f7077e20e548b771e53387f6628

nawawi/openstack,openstack-dev/devstack,noironetworks/devstack,dtroyer/devstack,openstack-dev/devstack,nawawi/openstack,noironetworks/devstack,dtroyer/devstack,group-policy/devstack,group-policy/devstack