RFR 8231598: keytool does not export sun.security.mscapi

[Weijun Wang]

Please take a look at

   http://cr.openjdk.java.net/~weijun/8231598/webrev.00/

For new grammars on how to add a provider in a module, use -addprovider (See 
[1]).

Thanks,
Max

[1] https://bugs.openjdk.java.net/browse/JDK-8130302