Code review for JDK-7145527 sscanf must use a length in the format string

[Ron Durbin]

    JDK-7145527 sscanf must use a length in the format string 

    http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7145527

    https://jbs.oracle.com/bugs/browse/JDK-7145527

  
    OpenJDK URL: http://cr.openjdk.java.net/~rdurbin/7145527-webrev/0-hsx25/

    Internal URL http://javaweb.us.oracle.com/~rdurbin/7145527-webrev/0-hsx25/

    Summary: All active HotSpot code is already using length specifiers for string arguments
    to scanf, fscanf and sscanf.
    Some dead code in debug.cpp was calling scanf incorrectly and this change will remove it.

    Testing: Regular JPRT build and test job