Implement READ CAPACITY(16) support
Implement READ CAPACITY(16) support

Parse the result and return it as a tuple.

Write a docstring for readcap.

Rename readcap_10() to readcap().

Signed-off-by: Andy Grover <b7d524d2f5cc5aebadb6b92b08d3ab26911cde33@redhat.com>

agrover/python-sgutils,agrover/python-sgutils