feat: report the licenses a BMC asks for as facts (0.5.0)

get_licenses (napalm-device-types LicenseMixin, 4.15) on redfish and bmc,
for NetOrk/netork#1111.

- A BMC that refuses Redfish altogether reports each license it names as
  missing, with its message.
- One that answers but withholds parts reports the license with withholds,
  e.g. DCMS withholding drives and the firmware inventory on an X10 with
  only SFT-OOB-LIC.
- ipmi knows no licenses.

get_device_warnings keeps its two codes until netOrk derives them.

tests/test_driver.py

@@ -511,6 +511,20 @@ def test_unlicensed_bmc_still_opens(server):
     }
 
 
+def test_unlicensed_bmc_names_every_license_it_asks_for_as_missing(server):
+    licenses = _unlicensed(server).get_licenses()
+    assert [(lic["name"], lic["status"]) for lic in licenses] == [
+        ("SUM", "missing"), ("DCMS", "missing"), ("OOB", "missing")]
+    # Refused altogether: nothing is withheld in part.
+    assert all("withholds" not in lic and "Not licensed" in lic["detail"] for lic in licenses)
+
+
+def test_a_licensed_bmc_reports_no_license_facts(server):
+    d = RedfishDriver("bmc.example.net", "netork", "s3cret", optional_args={"verify_ssl": False})
+    d.open()
+    assert d.get_licenses() == []
+
+
 def test_unlicensed_bmc_reports_the_missing_license(server):
     (warning,) = _unlicensed(server).get_device_warnings()
     assert warning["code"] == "bmc_license_required"