RFR 8162739: Create new keytool option to access cacerts file

[Weijun Wang]

Please review the code changes at

    http://cr.openjdk.java.net/~weijun/8162739/webrev.00/

A new -cacerts option is added to keytool so there is no need to provide 
the full cacerts path on the command line. lib/security/cacerts is 
considered an implementation detail and subject to change.

The conf/security/cacerts file in src/ is moved to lib/security/cacerts, 
which matches its destination path. A small change in make/ is needed.

Thanks
Max