nova-kvm: configure /etc/sysconfig/libvirtd

Adds the --listen option to the /etc/sysconfig/libvirtd file.
This would be required for migrations on distributions that use
this file.

This commit also fixes an issue w/ a21a2e7 where the debian
style file was copied into place on *all* distributions.
We should avoid writing unnecessary files to disk where
possible. As part of this fix the file was moved from being
configured w/ os-config-apply into the install.d. It is unlikely
these files will change often so I think this is Okay...

Change-Id: I3725897744c13184d72475e137ff9267ee5449fc
Closes-bug: #1279356

elements/nova-kvm/install.d/81-nova-kvm

@@ -6,3 +6,14 @@ set -eux
 # collision with the network on the seed host machine
 rm -f /etc/libvirt/qemu/networks/autostart/default.xml
 rm -f /etc/libvirt/qemu/networks/default.xml
+
+SCRIPTDIR=$(dirname $0)
+
+if [ -f /etc/sysconfig/libvirtd ]; then
+    install -D -g root -o root -m 0755 ${SCRIPTDIR}/default_libvirtd /etc/sysconfig/libvirtd
+elif [ -f /etc/default/libvirt-bin ]; then
+    install -D -g root -o root -m 0755 ${SCRIPTDIR}/default_libvirt_bin /etc/default/libvirt-bin
+else
+    echo "Unsupported libvirtd/libvirt-bin configuration."
+    exit 1
+fi

elements/nova-kvm/install.d/default_libvirtd

@@ -0,0 +1,24 @@
+# Override the default config file
+# NOTE: This setting is no longer honoured if using
+# systemd. Set '--config /etc/libvirt/libvirtd.conf'
+# in LIBVIRTD_ARGS instead.
+#LIBVIRTD_CONFIG=/etc/libvirt/libvirtd.conf
+
+# Listen for TCP/IP connections
+# NB. must setup TLS/SSL keys prior to using this
+LIBVIRTD_ARGS="--listen"
+
+# Override Kerberos service keytab for SASL/GSSAPI
+#KRB5_KTNAME=/etc/libvirt/krb5.tab
+
+# Override the QEMU/SDL default audio driver probing when
+# starting virtual machines using SDL graphics
+#
+# NB these have no effect for VMs using VNC, unless vnc_allow_host_audio
+# is enabled in /etc/libvirt/qemu.conf
+#QEMU_AUDIO_DRV=sdl
+#
+#SDL_AUDIODRIVER=pulse
+
+# Override the maximum number of opened files
+#LIBVIRTD_NOFILES_LIMIT=2048