adding alias CALLBACK == QLISTENER

transport/providers.py

@@ -51,6 +51,7 @@ RABBIT = RABBITMQ
 
 QLISTENER = 'qlistener'
 QUEUE = QLISTENER
+CALLBACK = QLISTENER
 DATABRICKS= 'databricks+connector'
 DRIVERS  = {PG:pg,REDSHIFT:pg,MYSQL:my,MARIADB:my,NETEZZA:nz,SQLITE:sqlite3}
 CATEGORIES ={'sql':[NETEZZA,PG,MYSQL,REDSHIFT,SQLITE,MARIADB],'nosql':[MONGODB,COUCHDB],'cloud':[NEXTCLOUD,S3,BIGQUERY,DATABRICKS],'file':[FILE],