Revert "Remove the --nspawn-extra-args cli option"

This reverts commit b8125ac1a6.

lib/ansible/cli/__init__.py

@@ -355,6 +355,8 @@ class CLI(with_metaclass(ABCMeta, object)):
                 help="specify extra arguments to pass to scp only (e.g. -l)")
             connect_group.add_option('--ssh-extra-args', default='', dest='ssh_extra_args',
                 help="specify extra arguments to pass to ssh only (e.g. -R)")
+            connect_group.add_option('--nspawn-extra-args', default='', dest='nspawn_extra_args',
+                help="specify extra arguments to pass to systemd-nspawn only (e.g. --bind)")
 
             parser.add_option_group(connect_group)
 

lib/ansible/plugins/connection/nspawn.py

@@ -34,6 +34,7 @@ class Connection(ConnectionBase):
                 *args, **kwargs)
 
         display.vvv("NSPAWN ARGS %s" % self._play_context.nspawn_args)
+        display.vvv("NSPAWN EXTRA ARGS %s" % self._play_context.nspawn_extra_args)
 
         self.chroot = self._play_context.remote_addr
 
@@ -68,7 +69,8 @@ class Connection(ConnectionBase):
                 else '/bin/sh')
 
         nspawn_args = shlex.split(self._play_context.nspawn_args)
-        local_cmd = [self.nspawn_cmd, '-D', self.chroot ] + nspawn_args + [
+        nspawn_extra_args = shlex.split(self._play_context.nspawn_extra_args)
+        local_cmd = [self.nspawn_cmd, '-D', self.chroot ] + nspawn_args + nspawn_extra_args + [
                 '--', executable, '-c', cmd]
 
         display.vvv("EXEC %s" % (local_cmd), host=self.chroot)