Fix get_options

Signed-off-by: Gustavo L. de M. Chaves <gnustavo@cpan.org>
Show Gerrit method arguments with Data::Dumper if --debug

Signed-off-by: Gustavo L. de M. Chaves <gnustavo@cpan.org>
Admit votes in multiple labels in 'review'

Signed-off-by: Gustavo L. de M. Chaves <gnustavo@cpan.org>