netcmd: claims: rename claims and silo tests

netcmd: claims: rename claims and silo tests

Rename test function names that were starting to get very long.

They were all prefixed with the test name, stop doing that and use double underscore for better separation.

e.g. AuthPolicyCmdTestCase.test_authentication_policy_list_json

becomes AuthPolicyCmdTestCase.test_list__json

The claim types and value types test cases have been split into two testcases.

Signed-off-by: Rob van der Linde <rob@catalyst.net.nz>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>