Prepare to 0.18.0 release

Signed-off-by: Victor Toso <victortoso@redhat.com>
Acked-by: Christophe Fergeau <cfergeau@redhat.com>
3 jobs for spice-vdagent-0.18.0 in 16 minutes and 24 seconds (queued for 2 minutes and 22 seconds)
latest
Status Job ID Name Coverage
  Test
passed #1203
configure-optional-packages

00:07:56

passed #1204
configure-without-optionals

00:08:25

passed #1202
make-check-distcheck

00:07:58