Move long commands from dotbot config into scripts

Move long commands from the dotbot config into own scripts to keep the
install.conf.yaml more readable.
Fix bug that the submodule init step fails when already done once since
then the grep statement fails because there is no output.

meta/submodules

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+[ $# -eq 1 ] || { echo "Specify what to do" >&2; exit 1; }
+
+case "$1" in
+	"--init") INIT=1;;
+	"--update") INIT=0;;
+	*) echo "Unknown option"; exit 1;;
+esac
+
+if (( $INIT )); then
+	out="$(git submodule update --init --recursive --jobs 8 --depth 1 2>&1)"
+	if ! (( $? )) && [ -n "$out" ] ; then
+		echo "$out" | grep "Cloning into"
+	fi
+else
+	git submodule update --remote
+fi