add gitmodules options

Author: Copper280z

.gitmodules

@@ -14,6 +14,12 @@
 [submodule "metis/GKlib"]
 	path = metis/GKlib
 	url = https://github.com/KarypisLab/GKlib.git
+	ignore = all
+	update = checkout
+	branch = master
 [submodule "metis/METIS"]
 	path = metis/METIS
 	url = https://github.com/KarypisLab/METIS.git
+	ignore = all
+	update = checkout
+	branch = master