Port java.util.zip.(CRC|Adler)32 changes from openJdk8u60

- Added new method for both CRC32 and Adler32:
update(ByteBuffer).
- Minor javadoc and header updates

Test: cts run of CtsLibcoreTestCases
Bug: 29935305
Change-Id: I80acc491d36f5b6a04e6a2dbeb461632d02389f6
6 files changed