Use ksa session for cinder microversion check17.0.2

[1] added a method to validate availability of a desired version of the
cinder API.  This method called into
cinderclient.client.get_highest_client_server_version to
(unsurprisingly) discover the highest available version to compare
against.  However, that routine uses a raw requests.get to access the
version document from the server.  This breaks when the endpoint URL is
using HTTPS, because nothing sets up the cert info for that call.

With this change, we work around the issue by duplicating the logic from
get_highest_client_server_version, but doing the version discovery via
the same keystoneauth1 session that's configured for use with the client
itself, thus inheriting any SSL configuration as appropriate.

[1] https://review.openstack.org/#/c/469579/

Change-Id: I4de355195281009a5979710d7f14ae8ea11d10e0
Closes-Bug: #1752152
(cherry picked from commit 20eaaee2334957eb8739ecca524a1c4aa9f246e9)

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