Add an on-device dashboard, project Gammarus

...and update everything. In just one commit because I'm super-green and
everything has been merged already anyway.

Change-Id: I7dbe85e66855d2758183db36094a0b7f8b1e351e
diff --git a/.gitmodules b/.gitmodules
index 6c1729d..5497189 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -9,3 +9,6 @@
 [submodule "submodules/netconf-cli"]
 	path = submodules/netconf-cli
 	url = ../netconf-cli
+[submodule "submodules/gammarus"]
+	path = submodules/gammarus
+	url = ../gammarus