rfe11911: Add materializer calls to python client

Added materializeEntailed and deleteMaterialized calls
to RepositoryConnection.

Added a test for the new methods.

Tests added for:     rfe11911
make test-suite run? yes - make python-prepush

Change-Id: Ib84a9a1355b55a5c7de7f076d0123d1a61172482
Reviewed-on: https://gerrit.franz.com:9080/2639
Reviewed-by: Ahmon Dancy <dancy@franz.com>
Reviewed-by: John O'Rourke <jor@franz.com>
Tested-by: Kevin Layer <layer@franz.com>
bug21459: Fix test_materializer in python tests

Changed the assert for the test_materializer function
to >= 40 instead of == 40 so that the materializer
can continue to evolve to add more triples.

No release notes or external changes to document.

Tests added for:     <list rfe/bug id's>
make test-suite run? yes - python-prepush

Change-Id: I6541760c4a08b9a46f20361e81b8e53ef564de0a
Reviewed-on: https://gerrit.franz.com:9080/2655
Reviewed-by: Ahmon Dancy <dancy@franz.com>
Reviewed-by: Kevin Layer <layer@franz.com>
Tested-by: Kevin Layer <layer@franz.com>