Network module cleanup (#17334)

* Clean up EOS, IOS, IOS-XR, Junos, NX-OS, and OpenSwitch

* Cleanup net* files

* Re-add NetworkModule import to network module_utils files

This will trick modules into importing code from module_utils code, thus
including it in the final Ansiballz zipfile.

* Give asa a look over, too

lib/ansible/module_utils/netcli.py

@@ -298,4 +298,3 @@ class Conditional(object):
     def matches(self, value):
         match = re.search(value, self.value, re.M)
         return match is not None
-