Add audit middleware options to barbican.conf

The default api-paste.ini file maintained in the Barbican repo provides
a pipeline with the audit middleware. This change adds the option for
the middleware to the barbican.conf file generated by generator, so
that users can find the related options easily.

Depends-on: https://review.opendev.org/804316
Change-Id: I9f3ee9968f7558498c6fdb31d9103750ec248446

etc/oslo-config-generator/barbican.conf

@@ -10,6 +10,7 @@ namespace = barbican.plugin.dogtag
 namespace = barbican.plugin.secret_store
 namespace = barbican.plugin.secret_store.kmip
 namespace = barbican.plugin.secret_store.vault
+namespace = keystonemiddleware.audit
 namespace = keystonemiddleware.auth_token
 namespace = oslo.log
 namespace = oslo.messaging

requirements.txt

@@ -25,7 +25,7 @@ pbr!=2.1.0,>=2.0.0 # Apache-2.0
 pecan!=1.0.2,!=1.0.3,!=1.0.4,!=1.2,>=1.0.0 # BSD
 pyOpenSSL>=17.1.0 # Apache-2.0
 ldap3>=1.0.2 # LGPLv3
-keystonemiddleware>=5.1.0 # Apache-2.0
+keystonemiddleware>=9.5.0 # Apache-2.0
 six>=1.10.0 # MIT
 SQLAlchemy!=1.1.5,!=1.1.6,!=1.1.7,!=1.1.8,>=1.0.10 # MIT
 stevedore>=1.20.0 # Apache-2.0