Ignore the log files

The new test framework produces a lot of log files (one for each
test).  Git doesn't need to know.
Reviewed-by: NRich Salz <rsalz@openssl.org>

.gitignore

@@ -27,6 +27,7 @@
 /test/.rnd
 /test/test*.pem
 /test/newkey.pem
+/test/*.log
 
 # Certificate symbolic links
 *.0