Increase KEYSTONE_LOCKOUT_DURATION to 10

Transient failures were being reported because the current lockout
period for users was too short. While this does increase the
run time IdentityV3UsersTest.test_user_account_lockout, it
allows for more flexibility if there is network latency or some
other factor that cause the lockout to expired before the
next authentication.

Change-Id: I61bc39bbc35ac414b4a72929a90845956c99eb1a
Closes-Bug: 1693917

Author: lbragstad

lib/keystone

@@ -124,7 +124,7 @@ KEYSTONE_SERVICE_URI_V3=$KEYSTONE_SERVICE_URI/v3
 # Security compliance
 KEYSTONE_SECURITY_COMPLIANCE_ENABLED=${KEYSTONE_SECURITY_COMPLIANCE_ENABLED:-True}
 KEYSTONE_LOCKOUT_FAILURE_ATTEMPTS=${KEYSTONE_LOCKOUT_FAILURE_ATTEMPTS:-2}
-KEYSTONE_LOCKOUT_DURATION=${KEYSTONE_LOCKOUT_DURATION:-5}
+KEYSTONE_LOCKOUT_DURATION=${KEYSTONE_LOCKOUT_DURATION:-10}
 KEYSTONE_UNIQUE_LAST_PASSWORD_COUNT=${KEYSTONE_UNIQUE_LAST_PASSWORD_COUNT:-2}