Recent changes to the gate base images [1] removed a package
neutron requires (netcat-openbsd). This patch installs the
required package.
[1] https://review.openstack.org/#/c/292573
Conflicts:
tools/configure_for_func_testing.sh
Closes-bug: #1558397
(cherry picked from commit 44ef44c0ff)
Change-Id: I4041478ca09bd124827782774b8520908ef07be0