Add JavaDoc, refactor staff for clean code convention and modify unit

tests

Signed-off-by: SirWayne <dennis.melzer@bosch-si.com>

hawkbit-security-core/src/main/java/org/eclipse/hawkbit/security/SystemSecurityContext.java

@@ -15,7 +15,6 @@ import java.util.concurrent.Callable;
 
 import org.eclipse.hawkbit.im.authentication.SpPermission.SpringEvalExpressions;
 import org.eclipse.hawkbit.tenancy.TenantAware;
-import org.eclipse.hawkbit.tenancy.TenantAware.TenantRunner;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -30,8 +29,7 @@ import org.springframework.stereotype.Service;
 import com.google.common.base.Throwables;
 
 /**
- * @author Michael Hirsch
- *
+ * 
  */
 @Service
 public class SystemSecurityContext {
@@ -45,15 +43,12 @@ public class SystemSecurityContext {
         final SecurityContext oldContext = SecurityContextHolder.getContext();
         try {
             logger.debug("entering system code execution");
-            return tenantAware.runAsTenant(tenantAware.getCurrentTenant(), new TenantRunner<T>() {
-                @Override
-                public T run() {
-                    try {
-                        setSystemContext();
-                        return callable.call();
-                    } catch (final Exception e) {
-                        throw Throwables.propagate(e);
-                    }
+            return tenantAware.runAsTenant(tenantAware.getCurrentTenant(), () -> {
+                try {
+                    setSystemContext();
+                    return callable.call();
+                } catch (final Exception e) {
+                    throw Throwables.propagate(e);
                 }
             });
 
@@ -106,7 +101,8 @@ public class SystemSecurityContext {
         }
 
         @Override
-        public void setAuthenticated(final boolean isAuthenticated) throws IllegalArgumentException {
+        public void setAuthenticated(final boolean isAuthenticated) {
+            // not needed
         }
     }
 }

hawkbit-security-core/src/main/java/org/eclipse/hawkbit/util/IpUtil.java

@@ -20,9 +20,6 @@ import com.google.common.net.HttpHeaders;
 /**
  * A utility which determines the correct IP of a connected {@link Target}. E.g
  * from a {@link HttpServletRequest}.
- * 
- *
- *
  *
  */
 public final class IpUtil {
@@ -103,12 +100,14 @@ public final class IpUtil {
      * 
      * @param host
      *            the host
+     * @param exchange
+     *            the exchange will store in the path
      * @return the {@link URI}
      * @throws IllegalArgumentException
      *             If the given string not parsable
      */
-    public static URI createAmqpUri(final String virtualHost, final String exchange) {
-        return createUri(AMPQP_SCHEME, virtualHost).resolve("/" + exchange);
+    public static URI createAmqpUri(final String host, final String exchange) {
+        return createUri(AMPQP_SCHEME, host).resolve("/" + exchange);
     }
 
     /**