Pin LXD version to 4.17

Change-Id: Ibcbbffd7be34462e4fb0521458ca739f1d0aa150
Signed-off-by: David Garcia <david.garcia@canonical.com>
diff --git a/installers/charmed_install.sh b/installers/charmed_install.sh
index 04a5678..2406b6a 100755
--- a/installers/charmed_install.sh
+++ b/installers/charmed_install.sh
@@ -15,6 +15,7 @@
 
 # set -eux
 
+LXD_VERSION=4.17
 JUJU_VERSION=2.9
 JUJU_AGENT_VERSION=2.9.12
 K8S_CLOUD_NAME="k8s-cloud"
@@ -158,7 +159,7 @@
         sudo sysctl --system
         # Install LXD snap
         sudo apt-get remove --purge -y liblxc1 lxc-common lxcfs lxd lxd-client
-        sudo snap install lxd
+        sudo snap install lxd --channel $LXD_VERSION/stable
         # Configure LXD
         sudo usermod -a -G lxd `whoami`
         cat /usr/share/osm-devops/installers/lxd-preseed.conf | sed 's/^config: {}/config:\n  core.https_address: '$LXDENDPOINT':8443/' | sg lxd -c "lxd init --preseed"