This change adds payload request and response base classes to
prepare for future simplification updates to the current client
architecture. No new tests are required for this change.
This change updates the PyKMIP object hierarchy's read/write
method signatures to support propagation of the KMIP version. The
introduction of KMIP 2.0 introduces future KMIP message encodings
that break backwards compatibility; to support this, PyKMIP must
know what KMIP version is being used when encoding or decoding an
object; the KMIP version residing in the client or server alone
is now insufficient. Prior versions of KMIP, namely 1.0 - 1.4,
have been backwards compatible, obviating the need for the KMIP
version at encode/decode time. Going forward, this is no longer
true.
The PyKMIP client and server have been updated to include the
KMIP version when making calls to read/write, as have the
associated test cases covering this functionality.
