Let "make test" survive without DEVRANDOM

(and rename a target in test/Makefile.ssl to make it
easier to guess the name of the file executed by it)

test/testgen

@@ -15,6 +15,8 @@ echo "There should be a 2 sequences of .'s and some +'s."
 echo "There should not be more that at most 80 per line"
 echo "This could take some time."
 
+echo "string to make the random number generator think it has entropy" >> ./.rnd
+
 ../apps/openssl req -config test.cnf -new -out testreq.pem
 if [ $? != 0 ]; then
 echo problems creating request