Previously, `get_credentials` raises either ValueError or re-raises
GSSError. The former makes the handling of this function more difficult
without a good reason.
With this change:
- `get_credentials` no longer handles exceptions by itself, but delegates
this to the callers (which already process GSS errors).
- `get_credentials_if_valid` doesn't raise any expected exceptions, but
return valid credentials (on the moment of calling) or None. This makes
it consistent with docs.
Related: https://pagure.io/freeipa/issue/8873
Signed-off-by: Stanislav Levin <slev@altlinux.org>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
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