Addition of session filter tracking in order to allow the show session

command to call the diagnostic entries points of the filters in the
session.

Slight improvements to the two example filters and a fix to the
trim routine.

server/core/service.c

@@ -626,7 +626,8 @@ char	*ptr;
 	while (isspace(*str))
 		str++;
 
-	ptr = str + strlen(str);
+	/* Point to last character of the string */
+	ptr = str + strlen(str) - 1;
 	while (ptr > str && isspace(*ptr))
 		*ptr-- = 0;