Tests: skip request body tests if auth_request module is absent

Author: defanator

tests/modsecurity-request-body.t

@@ -22,7 +22,7 @@ use Test::Nginx;
 select STDERR; $| = 1;
 select STDOUT; $| = 1;
 
-my $t = Test::Nginx->new()->has(qw/http/);
+my $t = Test::Nginx->new()->has(qw/http auth_request/);
 
 $t->write_file_expand('nginx.conf', <<'EOF');