Code formating and removing unused imports (#2072)

Signed-off-by: Avgustin Marinov <Avgustin.Marinov@bosch.com>

hawkbit-core/src/main/java/org/eclipse/hawkbit/cache/TenantAwareCacheManager.java

@@ -11,7 +11,6 @@ package org.eclipse.hawkbit.cache;
 
 import java.util.Collection;
 import java.util.Collections;
-import java.util.stream.Collectors;
 
 import org.eclipse.hawkbit.tenancy.TenantAware;
 import org.springframework.cache.Cache;

hawkbit-core/src/main/java/org/eclipse/hawkbit/exception/AbstractServerRtException.java

@@ -93,7 +93,8 @@ public abstract class AbstractServerRtException extends RuntimeException {
      * @param error detail
      * @param cause of the exception
      */
-    protected AbstractServerRtException(final String message, final SpServerError error, final Throwable cause, final Map<String, Object> info) {
+    protected AbstractServerRtException(
+            final String message, final SpServerError error, final Throwable cause, final Map<String, Object> info) {
         super(message, cause);
         this.error = error;
         this.info = info;

hawkbit-core/src/main/java/org/eclipse/hawkbit/exception/SpServerError.java

@@ -152,8 +152,8 @@ public enum SpServerError {
     SP_REPO_OPERATION_NOT_SUPPORTED(
             "hawkbit.server.error.operation.notSupported",
             "Operation or method is (no longer) supported by service."),
-   SP_MAINTENANCE_SCHEDULE_INVALID(
-           "hawkbit.server.error.maintenanceScheduleInvalid",
+    SP_MAINTENANCE_SCHEDULE_INVALID(
+            "hawkbit.server.error.maintenanceScheduleInvalid",
             "Information for schedule, duration or timezone is missing; or there is no valid maintenance window available in future."),
     SP_AUTO_ASSIGN_ACTION_TYPE_INVALID(
             "hawkbit.server.error.repo.invalidAutoAssignActionType",