RFR [13] JDK-8215430: Remove the internal package com.sun.net.ssl

[Xuelei Fan]

Hi,

Could I get the following update reviewed:
    http://cr.openjdk.java.net/~xuelei/8215430/webrev.00/

The internal package com.sun.net.ssl had been deprecated since JDK 1.4, 
and was not exported in the java.base module since JDK 9. It should be 
safe to remove them in JDK 13.

For more details, please refer to CSR:
     https://bugs.openjdk.java.net/browse/JDK-8218932

Thanks,
Xuelei