AVA.toString() result depends on debug flag

[Weijun Wang]

In sun.security.x509.AVA, there are 3 places where

   } else if (debug != null && Debug.isOn("ava")) {

is checked. If it's true, string representations of an AVA object uses 
\HEX dump for non-printable characters. This is nice for debugging 
purposes, but the output of a method depending on a debug flag is really 
not a good idea.

The logic was introduced by Charlie in fix for 4505980.

I suggest we always use \HEX.

Thanks
Max