move device managers to hooks

hooks/mdevd/mdevd.init

@@ -0,0 +1,13 @@
+# vim: set ft=sh:
+# shellcheck shell=sh
+#
+# false positive
+# shellcheck disable=2154,2034
+#
+# run_mdevd()
+{
+    [ "$break" = devmgr ] && { print "break before run_mdevd()"; sh; }
+    
+    mdevd 2> /dev/null & mdevd_pid="$!"
+    mdevd-coldplug
+}