Remove deprecation of snmp drivers

Now that there is a gate running with virtual pdu we can officially
keep it an support it

Change-Id: Ie6accaa2a29007fa2e0c97329e37efd5f907fc7b

ironic/drivers/fake.py

@@ -219,8 +219,6 @@ class FakeDracDriver(base.BaseDriver):
 class FakeSNMPDriver(base.BaseDriver):
     """Fake SNMP driver."""
 
-    supported = False
-
     def __init__(self):
         if not importutils.try_import('pysnmp'):
             raise exception.DriverLoadError(

ironic/drivers/pxe.py

@@ -234,8 +234,6 @@ class PXEAndSNMPDriver(base.BaseDriver):
     class is merely the glue between them.
     """
 
-    supported = False
-
     def __init__(self):
         # Driver has a runtime dependency on PySNMP, abort load if it is absent
         if not importutils.try_import('pysnmp'):

releasenotes/notes/pxe-snmp-driver-supported-9c559c6182c6ec4b.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - The pxe_snmp and fake_snmp are now supported and
+    tested.