rm openvpn:openvpn user/group iff openvpn pkg is removed. shellcheck cleanup. preliminary fixes. add (global) FIXMEs.
rm openvpn:openvpn user/group iff openvpn pkg is removed. shellcheck cleanup. preliminary fixes. add (global) FIXMEs.

Signed-off-by: corbolais <a06ec8e544b26f3b5acaed6096bbd890a3398f31@gmail.com>

pivpn/pivpn