Save stc temp logs in the stc folder

There was an issue when OCN was set to localhost. As part of Net-Smoke,
the command 'mn -c' is run which removes '/tmp/*.log'. This potentially
caused some tests to fail.

Change-Id: If68c184902b994e1ee38ea775c378ce29cdb891f
diff --git a/tools/test/scenarios/bin/curl-with-retry b/tools/test/scenarios/bin/curl-with-retry
index c9546ae..c77b284 100755
--- a/tools/test/scenarios/bin/curl-with-retry
+++ b/tools/test/scenarios/bin/curl-with-retry
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-aux=/tmp/stc-$$.log
+aux=/tmp/stc/stc-$$.log
 trap "rm -f $aux 2>/dev/null" EXIT
 
 url=$1