BUG/MINOR: server: Fix a wrong error message during 'usesrc' keyword parsing.

'usesrc' setting is not permitted on 'server' lines if not provided after
'source' setting. This is now also the case on 'default-server' lines.
Without this patch parse_server() parser displayed that 'usersrc' is
an unknown keyword.

Should have come with dba9707 commit.
1 file changed