KEYCLOAK-1183 Split subsystem into separate server and adapter subsystems

- Renamed keycloak-subsystem into keycloak-server-subsystem
 - Added keycloak-adapter-subsystem without auth-server support
 - Removed adapter config from keycloak-server subsystem
 - Added proper .xsd for server subsystem

pom.xml

@@ -43,7 +43,7 @@
         <slf4j.version>1.5.10</slf4j.version>
         <jboss.version>7.1.1.Final</jboss.version>
         <wildfly.version>8.2.0.Final</wildfly.version>
-        <wildfly.core.version>1.0.0.Alpha12</wildfly.core.version>
+        <wildfly.core.version>1.0.0.Beta3</wildfly.core.version>
         <servlet.api.30.version>1.0.2.Final</servlet.api.30.version>
         <google.zxing.version>2.2</google.zxing.version>
         <google.client.version>1.14.1-beta</google.client.version>