rrdcgi1/rrdtool1: move to database submenu

Part of a wider housekeeping effort on the packages repository.

Signed-off-by: Alberto Bursi <alberto.bursi@outlook.it>

utils/rrdtool1/Makefile

@@ -61,6 +61,7 @@ define Package/rrdcgi1
 $(call Package/rrdtool1/Default)
   SECTION:=utils
   CATEGORY:=Utilities
+  SUBMENU:=database
   DEPENDS:=+librrd1
   TITLE+= CGI graphing tool
 endef
@@ -75,6 +76,7 @@ define Package/rrdtool1
 $(call Package/rrdtool1/Default)
   SECTION:=utils
   CATEGORY:=Utilities
+  SUBMENU:=database
   DEPENDS:=+librrd1
   TITLE+= management tools
 endef