Feature Max Artifact Storage quota (#739)

* Enforcement of artifact storage quota
* Added REST integration tests for artifact upload
* Fix test config
* Fix failing test cases
* Fix PR review findings

Signed-off-by: Stefan Behl <stefan.behl@bosch-si.com>

hawkbit-repository/hawkbit-repository-api/src/main/java/org/eclipse/hawkbit/repository/QuotaManagement.java

@@ -92,8 +92,13 @@ public interface QuotaManagement {
     int getMaxActionsPerTarget();
 
     /**
-     * @return the maximum size of software artifacts in bytes
+     * @return the maximum size of artifacts in bytes
      */
     long getMaxArtifactSize();
 
+    /**
+     * @return the accumulated maximum size of all artifacts in bytes
+     */
+    long getMaxArtifactStorage();
+
 }