Updated git submodules

Updated git submodules

Project: netvirt master ea33bf6ce1716882c1f3f03c6a24218a3fa4a04a

dhcpservice: clean up Futures collections

This patch replaces lists of Futures with singleton lists where
possible. It also removes instances of passing such lists around,
using return values instead.

This patch also cleans up the job classes generally: instance fields
are final where possible, unused fields and parameters are removed.

Change-Id: Idd1add34a0ac75aaf7ae0afc137904cebfb7e741
Signed-off-by: Stephen Kitt <skitt@redhat.com>