Add pin for the version of PySAML2 in tox

Jean Chorinrequested to merge
workaround-pysaml2-keystone-fail into master

See issue #416 (closed)

When the version 6.5.0 of PySAML2 was released, the keystone unit tests started with tox in the CI pipelines all failed.

To prevent this, a workaround is added, pinning the package to a functioning version.

Signed-off-by: Jean Chorin jean.chorin@cloudandheat.com

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