ifcfg-rh: drop unused "nm-inotify-helper.h"

This code is now unused. Also, it does not seem state of the art to me
anymore. Drop it, it could always be resurrected if need by, but may
GFileMonitor should be used instead.
12 jobs for th/drop-monitor-connection-files in 37 minutes and 33 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #322422
allowed to fail
checkpatch

00:00:59

passed #322429
t_debian:9

00:23:09

passed #322431
t_debian:sid

00:27:57

manual #322430
allowed to fail manual
t_debian:testing
passed #322423
t_fedora:28

00:37:33

passed #322424
t_fedora:29

00:36:36

passed #322425
t_fedora:30

00:30:08

manual #322426
allowed to fail manual
t_fedora:rawhide
passed #322427
t_ubuntu:16.04

00:15:24

passed #322428
t_ubuntu:18.04

00:23:16

 
  External
failed NetworkManager test verification

failed NetworkManager test verification

05:30:12