When using 'local' connections, privilege escalation would fail if
ansible_ssh_user was in the current context to the same value as
become_user.
This commit ensures that for 'local' connections we reset remote_user to
the local username.
This fixes#12782.
There doesn't appear to be anything that actually uses tmp_path in the
connection plugins so we don't need to pass that in to exec_command.
That change also means that we don't need to pass tmp_path around in
many places in the action plugins any more. there may be more cleanup
that can be done there as well (the action plugin's public run() method
takes tmp as a keyword arg but that may not be necessary).
As a sideeffect of this patch, some potential problems with chmod and
the patch, assemble, copy, and template modules has been fixed (those
modules called _remote_chmod() with the wrong order for their
parameters. Removing the tmp parameter fixed them.)
Toshio Kuratomi
Lars Kellogg-Stedman
Brian Coca