keycloak 13 upgrade

The upgrade to Keycloak 13 broke due to changes in the xml file. Our standalone.xml file needs to be updated to be compatible with Keycloak 13.

2021-05-23 11:07:06,682 DEBUG [org.jboss.as.config] (MSC service thread 1-1) VM Arguments: -D[Standalone] -Xms64m -Xmx512m -XX:MetaspaceSize=96M -XX:MaxMetaspaceSize=256m -Djava.net.preferIPv4Stack=true -Djboss.modules.system.pkgs=org.jboss.byteman -Djava.awt.headless=true --add-exports=java.base/sun.nio.ch=ALL-UNNAMED --add-exports=jdk.unsupported/sun.misc=ALL-UNNAMED --add-exports=jdk.unsupported/sun.reflect=ALL-UNNAMED -Dorg.jboss.boot.log.file=/opt/keycloak/standalone/log/server.log -Dlogging.configuration=file:/opt/keycloak/standalone/configuration/logging.properties
2021-05-23 11:07:08,430 INFO  [org.wildfly.security] (ServerService Thread Pool -- 18) ELY00001: WildFly Elytron version 1.15.3.Final
2021-05-23 11:07:09,003 INFO  [org.jboss.as.controller] (Controller Boot Thread) OPVDX003: No schemas available from /opt/keycloak/docs/schema - disabling validation error pretty printing
2021-05-23 11:07:09,010 ERROR [org.jboss.as.server] (Controller Boot Thread) WFLYSRV0055: Caught exception during boot: org.jboss.as.controller.persistence.ConfigurationPersistenceException: WFLYCTL0085: Failed to parse configuration
	at org.jboss.as.controller@15.0.1.Final//org.jboss.as.controller.persistence.XmlConfigurationPersister.load(XmlConfigurationPersister.java:143)
	at org.jboss.as.server@15.0.1.Final//org.jboss.as.server.ServerService.boot(ServerService.java:403)
	at org.jboss.as.controller@15.0.1.Final//org.jboss.as.controller.AbstractControllerService$1.run(AbstractControllerService.java:416)
	at java.base/java.lang.Thread.run(Thread.java:832)
Caused by: javax.xml.stream.XMLStreamException: ParseError at [row,col]:[471,9]
Message: Unexpected element '{urn:wildfly:microprofile-config-smallrye:1.0}subsystem'
	at org.jboss.staxmapper@1.3.0.Final//org.jboss.staxmapper.XMLMapperImpl.processNested(XMLMapperImpl.java:120)
	at org.jboss.staxmapper@1.3.0.Final//org.jboss.staxmapper.XMLExtendedStreamReaderImpl.handleAny(XMLExtendedStreamReaderImpl.java:69)
	at org.jboss.as.server@15.0.1.Final//org.jboss.as.server.parsing.StandaloneXml_10.parseServerProfile(StandaloneXml_10.java:587)
	at org.jboss.as.server@15.0.1.Final//org.jboss.as.server.parsing.StandaloneXml_10.readServerElement(StandaloneXml_10.java:222)
	at org.jboss.as.server@15.0.1.Final//org.jboss.as.server.parsing.StandaloneXml_10.readElement(StandaloneXml_10.java:119)
	at org.jboss.as.server@15.0.1.Final//org.jboss.as.server.parsing.StandaloneXml.readElement(StandaloneXml.java:126)
	at org.jboss.as.server@15.0.1.Final//org.jboss.as.server.parsing.StandaloneXml.readElement(StandaloneXml.java:52)
	at org.jboss.staxmapper@1.3.0.Final//org.jboss.staxmapper.XMLMapperImpl.processNested(XMLMapperImpl.java:122)
	at org.jboss.staxmapper@1.3.0.Final//org.jboss.staxmapper.XMLMapperImpl.parseDocument(XMLMapperImpl.java:76)
	at org.jboss.as.controller@15.0.1.Final//org.jboss.as.controller.persistence.XmlConfigurationPersister.load(XmlConfigurationPersister.java:126)
	... 3 more

2021-05-23 11:07:09,014 FATAL [org.jboss.as.server] (Controller Boot Thread) WFLYSRV0056: Server boot has failed in an unrecoverable manner; exiting. See previous messages for details.
2021-05-23 11:07:09,045 INFO  [org.jboss.as] (MSC service thread 1-2) WFLYSRV0050: Keycloak 13.0.0 (WildFly Core 15.0.1.Final) stopped in 8ms