Fixed log error messages from keystone to syslog.

Rsyslog adapted to filter keystone error log messages.

Related bug: 1516462

Change-Id: I4d8d4280dc8fef870d56d8466ed466241ee18e64

ansible/roles/common/templates/rsyslog.conf.j2

@@ -61,7 +61,8 @@ $template NeutronL3AgentFile,"/var/log/neutron/neutron-l3-agent.log"
 :syslogtag,contains,"neutron-l3-agent" ?NeutronL3AgentFile
 
 $template KeystoneErrorFile,"/var/log/keystone/keystone-error.log"
-:syslogtag,contains,"keystone-error" ?KeystoneErrorFile
+if ($syslogtag contains "keystone-error") \
+or ($syslogtag contains "keystone" and $syslogseverity <=4) then ?KeystoneErrorFile
 
 $template KeystoneAccessFile,"/var/log/keystone/keystone-access.log"
 :syslogtag,contains,"keystone-access" ?KeystoneAccessFile

ansible/roles/keystone/templates/keystone.conf.j2

 [DEFAULT]
 verbose = {{ keystone_logging_verbose }}
 debug = {{ keystone_logging_debug }}
+syslog_log_facility=LOG_LOCAL0
+use_syslog = True
 
 admin_token = {{ keystone_admin_token }}