Allow to export the client config separated in a .ovpn and .p12 file

On android, it's more secure to import your certificate in the android hardware keychain.

See here for details

It would be interesting to also have a parameter for ovpn_getclient to make a .ovpn file and a .p12 file.

I'm now doing that in the following way:

CLIENTNAME=some-smartphone
docker run -v openvpn-data:/etc/openvpn --log-driver=none --rm -it kylemanna/openvpn easyrsa build-client-full $CLIENTNAME
docker run -v openvpn-data:/etc/openvpn --log-driver=none --rm -it kylemanna/openvpn easyrsa export-p12 $CLIENTNAME
cp /var/lib/docker/volumes/openvpn-data/_data/pki/private/$CLIENTNAME.p12 /home/myuser/
chmod a+r /home/myuser/$CLIENTNAME.p12
docker run -v openvpn-data:/etc/openvpn --log-driver=none --rm kylemanna/openvpn ovpn_getclient $CLIENTNAME > /home/myuser/$CLIENTNAME.ovpn
sed -i "/<key>/,/<\/ca>/d" /home/myuser/$CLIENTNAME.ovpn

Afterwards, load the .p12 file by simply opening it in android and then import the .ovpn file in the "OpenVPN for Android" app.

Start at the ovpn_getclient entry point and compare its current output with the easyrsa build-client-full and export-p12 workflow shown in the issue. The change is complete when the command can produce separate .ovpn and .p12 files that support the described OpenVPN for Android import flow without requiring manual editing.