Suppress Bandit B509 in snmp.py

Bandit's B509 (SNMPv3 no authentication/privacy) check is
triggered by our line wrapping, as the check looks at the
number of arguments, and triggers if it only parses 3 arguments.

In Ironic's case, we pass five arguments. Presumably, this is due
to the line wrapping. Ultimately this bandit check is very new
having only been added with in the last few months.

Change-Id: Idaee72a53a1f33bcab940c6ebe1e7c113a1cb1ce
(cherry picked from commit e02ab89410)

ironic/drivers/modules/snmp.py

@@ -230,7 +230,10 @@ class SNMPClient(object):
             object depending on SNMP version being used.
         """
         if self.version == SNMP_V3:
-            return snmp.UsmUserData(
+            # NOTE(TheJulia): Ignore Bandit error B509 argument parsing as
+            # the check is for a count of <3 arguments, however our line
+            # wrapping causes the check to trigger.
+            return snmp.UsmUserData(  # nosec B509
                 self.user,
                 authKey=self.auth_key,
                 authProtocol=self.auth_proto,