Obtain and control VSP package upload status

Obtain the upload status and control the upload from the frontend
perspective.

Change-Id: Idcc921cf592efea33df35c557afcfae827af3a39
Issue-ID: SDC-3862
Signed-off-by: andre.schmid <andre.schmid@est.tech>
diff --git a/openecomp-ui/src/nfvo-components/loader/LoaderReducer.js b/openecomp-ui/src/nfvo-components/loader/LoaderReducer.js
index 3f9eb17..4222c3d 100644
--- a/openecomp-ui/src/nfvo-components/loader/LoaderReducer.js
+++ b/openecomp-ui/src/nfvo-components/loader/LoaderReducer.js
@@ -32,7 +32,9 @@
                 isLoading: true
             };
         case actionTypes.RECEIVE_RESPONSE:
-            fetchingRequests--;
+            if (fetchingRequests > 0) {
+                fetchingRequests--;
+            }
 
             newArray = state.currentlyFetching.filter(item => {
                 return item !== action.url;