Fix test_out_option

Random path generation code in test/recipes/15-test_out_option.t
does not work: The code sets rand_path to "/test.pem". I.e. the
test will fail as expected for unprivileged user but will pass
for root user.
Signed-off-by: NPatrick Steuer <patrick.steuer@de.ibm.com>
Reviewed-by: NBernd Edlinger <bernd.edlinger@hotmail.de>
Reviewed-by: NRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5595)

test/recipes/15-test_out_option.t

@@ -36,7 +36,8 @@ test_illegal_path('../');
 
 # Test for trying to create a file in a non-exist directory
 my @chars = ("A".."Z", "a".."z", "0".."9");
-my $rand_path = $chars[rand @chars] for 1..32;
+my $rand_path = "";
+$rand_path .= $chars[rand @chars] for 1..32;
 $rand_path .= "/test.pem";
 
 test_illegal_path($rand_path);