Certain files must be removed before generating them, in case they point

into a read-only source tree.
PR: 437

test/testgen

@@ -27,6 +27,8 @@ fi
 
 echo "This could take some time."
 
+rm testkey.pem testreq.pem
+
 ../apps/openssl req -config test.cnf $req_new -out testreq.pem
 if [ $? != 0 ]; then
 echo problems creating request