feature/api-controller-improvements (#567)

* added error handler for api controller
* while downloading the config from the api, the Connecting status is now displayed
* added a button to delete container config for api servers
* added crc check to avoid re-import of api configs
* fixed currentIndex of serversMenuContent after DefaultServerIndexChanged
* added closing the import window after re-importing the config from api

client/ui/qml/Pages2/PageSetupWizardViewConfig.qml

@@ -18,8 +18,12 @@ PageType {
     Connections {
         target: ImportController
 
-        function onImportErrorOccurred(errorMessage) {
-            PageController.closePage()
+        function onImportErrorOccurred(errorMessage, goToPageHome) {
+            if (goToPageHome) {
+                PageController.goToStartPage()
+            } else {
+                PageController.closePage()
+            }
             PageController.showErrorMessage(errorMessage)
         }