Suppress shutdown indicator in Ubuntu

We want to quit machines without being asked, if we are
really sure.

Change-Id: Ic7156f5b0fe236c0270d8c2e4fcc322a82776caf
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@qt.io>

coin/provisioning/qtci-linux-Ubuntu-14.04-x86_64/001-suppress-shutdown-indicator.sh

+#!/usr/bin/env sh
+
+# Disable questions on shutdown.
+gsettings set com.canonical.indicator.session suppress-logout-restart-shutdown true

coin/provisioning/qtci-linux-Ubuntu-15.04-x86_64/001-suppress-shutdown-indicator.sh

+#!/usr/bin/env sh
+
+# Disable questions on shutdown.
+gsettings set com.canonical.indicator.session suppress-logout-restart-shutdown true

coin/provisioning/qtci-linux-Ubuntu-16.04-x86_64/001-suppress-shutdown-indicator.sh

+#!/usr/bin/env sh
+
+# Disable questions on shutdown.
+gsettings set com.canonical.indicator.session suppress-logout-restart-shutdown true