Support for username-only auth file.

Make OpenVPN read the username from the auth file
parameter of --auth-user-pass and prompt for a
password if it's not in the file.

Rationale: Prior to this change OpenVPN either
required both username and password present in the
auth file or prompted for both on the console.
Unlike passwords usernames usually don't change and
can therefore be "hardcoded" in the config.

Signed-off-by: Michal Ludvig <mludvig@logix.net.nz>