RFR 8162752: keytool -importkeystore should probe srcstoretype if not specified

[Weijun Wang]

Hi All

Please review the fix at
   http://cr.openjdk.java.net/~weijun/8162752/webrev.00/

for

   8162752: keytool -importkeystore should probe srcstoretype if not 
specified
   https://bugs.openjdk.java.net/browse/JDK-8162752

Keytool uses 1 flag to manage 2 options, 2 is better.

Thanks
Max