fix: [docker-host] remove warning about ``/etc/default/lxc`` not existent

precise/host/hooks/install.d/70-0k.sh

@@ -103,19 +103,21 @@ apt-get install -y kal-shlib-charm </dev/null
     git pull -r &&
     ln -sfn /opt/apps/lxc-scripts/bin/lxc-* /usr/local/sbin/ &&
 
-    if [ -f /etc/default/lxc.pre-install ]; then
-        cp /etc/default/lxc.pre-install /etc/default/lxc
-    else
-        cp /etc/default/lxc /etc/default/lxc.pre-install
+    if [ -f /etc/default/lxc ]; then
+        if [ -f /etc/default/lxc.pre-install ]; then
+            cp /etc/default/lxc.pre-install /etc/default/lxc
+        else
+            cp /etc/default/lxc /etc/default/lxc.pre-install
+        fi
+        [ -d /usr/lib/lxc/templates ] && {
+            ln -sfn /opt/apps/lxc-scripts/usr/lib/lxc/templates/lxc-0k-ubuntu-cloud /usr/lib/lxc/templates/
+            echo TEMPLATE_PATH=/usr/lib/lxc/templates >> /etc/default/lxc
+        }
+        [ -d /usr/share/lxc/templates ] && {
+            ln -sfn /opt/apps/lxc-scripts/usr/lib/lxc/templates/lxc-0k-ubuntu-cloud /usr/share/lxc/templates
+            echo TEMPLATE_PATH=/usr/share/lxc/templates >> /etc/default/lxc
+        }
     fi
-    [ -d /usr/lib/lxc/templates ] && {
-        ln -sfn /opt/apps/lxc-scripts/usr/lib/lxc/templates/lxc-0k-ubuntu-cloud /usr/lib/lxc/templates/
-        echo TEMPLATE_PATH=/usr/lib/lxc/templates >> /etc/default/lxc
-    }
-    [ -d /usr/share/lxc/templates ] && {
-        ln -sfn /opt/apps/lxc-scripts/usr/lib/lxc/templates/lxc-0k-ubuntu-cloud /usr/share/lxc/templates
-        echo TEMPLATE_PATH=/usr/share/lxc/templates >> /etc/default/lxc
-    }
 )
 
 ##