Revert "AP-1207 - abort query on tap termination (#168)" (#174)

This reverts commit 34977a3.

tap_postgres/__init__.py

@@ -6,7 +6,6 @@
 import psycopg2.extensions
 import singer
 import singer.schema
-import signal
 
 from singer import utils, metadata, get_bookmark
 from singer.catalog import Catalog
@@ -22,20 +21,6 @@
     dump_catalog, clear_state_on_replication_change,
     is_selected_via_metadata, refresh_streams_schema, any_logical_streams)
 
-
-psycopg2.extensions.set_wait_callback(psycopg2.extras.wait_select)
-
-
-def handle_signal(sig=None, frame=None):
-    """
-    signal handler for sigterms
-    raise sigint because that's how psycopg2 aborts running queries
-    """
-    raise KeyboardInterrupt("RECEIVED SIGTERM. RAISING SIGINT TO ABORT POSTGRES QUERY")
-
-
-signal.signal(signal.SIGTERM, handle_signal)
-
 LOGGER = singer.get_logger('tap_postgres')
 
 REQUIRED_CONFIG_KEYS = [