Revert "remove useless cjdns-resume"

cjdns-resume is still referenced from a number of other places, please fix them as well, use grep -nr

This reverts commit d1a0ad92cadd16286444ab9932db9a8ad0fd98ba.

contrib/systemd/cjdns-resume.service

@@ -0,0 +1,10 @@
+[Unit]
+Description=Restart cjdns on resume from sleep
+After=sleep.target
+
+[Service]
+Type=oneshot
+ExecStart=/bin/systemctl restart cjdns
+
+[Install]
+WantedBy=sleep.target

contrib/systemd/cjdns.service

@@ -19,3 +19,4 @@ Restart=always
 
 [Install]
 WantedBy=multi-user.target
+Also=cjdns-resume.service