Setting it to async method (#112)

Author: haresh-suresh

sdcclient/_scanning.py

@@ -307,7 +307,7 @@ def get_pdf_report(self, image, tag=None, date=None):
 
         return [True, res.content]
 
-    def import_image(self, infile, sync=True):
+    def import_image(self, infile, sync=False):
         '''**Description**
             Import an image archive