Revert "Remove momdemmanager"

This reverts commit 48dcdfa417.

modemmanager/files/modemmanager.init

@@ -0,0 +1,36 @@
+#!/bin/sh /etc/rc.common
+# Copyright (C) 2016 Aleksander Morgado <aleksander@aleksander.es>
+
+USE_PROCD=1
+START=70
+
+stop_service() {
+	# Load common utils
+	. /usr/share/ModemManager/modemmanager.common
+	# Set all configured interfaces as unavailable
+	mm_cleanup_interfaces
+}
+
+start_service() {
+	# Setup ModemManager service
+	#
+	# We will make sure that the rundir always exists, and we initially cleanup
+	# all interfaces flagging them as unavailable.
+	#
+	# The cached events processing will wait for MM to be available in DBus
+	# and will make sure all ports are re-notified to ModemManager every time
+	# it starts.
+	#
+	# All these commands need to be executed on every MM start, even after
+	# procd-triggered respawns, which is why they're all included as instance command
+	#
+	procd_open_instance
+	procd_set_param command sh -c ". /usr/share/ModemManager/modemmanager.common;    \
+	                               mkdir -m 0755 -p ${MODEMMANAGER_RUNDIR};          \
+	                               mm_cleanup_interfaces;                            \
+	                               ( mm_report_events_from_cache ) >/dev/null 2>&1 & \
+	                               /usr/sbin/ModemManager"
+	procd_set_param respawn "${respawn_threshold:-3600}" "${respawn_timeout:-5}" "${respawn_retry:-5}"
+	procd_set_param pidfile "${MODEMMANAGER_PID_FILE}"
+	procd_close_instance
+}