All exceptions subclassed from OSError now cause connection retry

attempts, subject to the connection "retry_count" and "retry_delay"
(#420).

doc/src/release_notes.rst

@@ -21,6 +21,10 @@ Thin Mode Changes
     :data:`oracledb.DB_TYPE_LONG` or :data:`oracledb.DB_TYPE_LONG_RAW` to
     to a different compatible type
     (`issue 424 <https://github.com/oracle/python-oracledb/issues/424>`__).
+#)  All exceptions subclassed from ``OSError`` now cause connection retry
+    attempts, subject to the connection ``retry_count`` and ``retry_delay``
+    parameters
+    (`issue 420 <https://github.com/oracle/python-oracledb/issues/420>`__).
 
 Thick Mode Changes
 ++++++++++++++++++

src/oracledb/impl/thin/connection.pyx

@@ -331,8 +331,7 @@ cdef class ThinConnImpl(BaseThinConnImpl):
         try:
             protocol._connect_phase_one(self, params, description,
                                         address, connect_string)
-        except (exceptions.DatabaseError, socket.gaierror,
-                ConnectionRefusedError) as e:
+        except (exceptions.DatabaseError, socket.gaierror, OSError) as e:
             if raise_exception:
                 errors._raise_err(errors.ERR_CONNECTION_FAILED, cause=e,
                                   connection_id=description.connection_id)