Add a new middleware that can be used to fetch an encryption root
secret from a KMIP service. The middleware uses a PyKMIP client
to interact with a KMIP endpoint. The middleware is configured with
a unique identifier for the key to be fetched and options required
for the PyKMIP client.
Co-Authored-By: Tim Burke <tim.burke@gmail.com>
Change-Id: Ib0943fb934b347060fc66c091673a33bcfac0a6d
1951dc7e9a