[type/__hostname] Add support for OpenWrt

cdist/conf/type/__hostname/gencode-remote

@@ -69,6 +69,9 @@ in
     centos|fedora|redhat|scientific|freebsd|netbsd|openbsd|gentoo|void)
         echo "hostname '$name_should'"
     ;;
+    openwrt)
+        echo "echo '$name_should' >/proc/sys/kernel/hostname"
+    ;;
     macosx)
         echo "scutil --set HostName '$name_should'"
     ;;

cdist/conf/type/__hostname/manifest

@@ -149,6 +149,10 @@ in
     openbsd)
         echo "$name_should" | __file /etc/myname --source -
     ;;
+    openwrt)
+        __uci system.@system[0].hostname --value "$name_should"
+            # --transaction hostname
+    ;;
     slackware)
         # We write the FQDN into /etc/HOSTNAME.  But /etc/rc.d/rc.M will only
         # read the first component from this file and set it as the running