KEYCLOAK-8300 KEYCLOAK-8301 Wildfly 14 upgrade

Co-authored-by: Marek Posolda <mposolda@redhat.com>

common/pom.xml

@@ -32,6 +32,9 @@
     <description>Common library and dependencies shared with server and all adapters</description>
 
     <properties>
+        <maven.compiler.target>1.7</maven.compiler.target>
+        <maven.compiler.source>1.7</maven.compiler.source>
+
         <timestamp>${maven.build.timestamp}</timestamp>
         <maven.build.timestamp.format>yyyy-MM-dd HH:mm</maven.build.timestamp.format>
         <keycloak.osgi.export>
@@ -69,15 +72,6 @@
             </resource>
         </resources>
         <plugins>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <configuration>
-                    <source>${maven.compiler.source}</source>
-                    <target>${maven.compiler.target}</target>
-                </configuration>
-            </plugin>
-
             <!-- Adding OSGI metadata to the JAR without changing the packaging type. -->
             <plugin>
                 <artifactId>maven-jar-plugin</artifactId>