Nzpy hangs if backend sends notice just after handshake completion

[shabbir10july]

It is observed that in some cases, nzpy hangs if backend sends notice just after handshake completion. For e.g: due to some issue in system, a notice is sent everytime nzsql is fired.

[nz@ipshost-0 nzbatchbnr_test]$ nzsql -l
NOTICE:  SET PATH: unable to locate the schema / database 'SQLEXT'
  List of databases
   DATABASE   | OWNER
--------------+-------
 SYSTEM       | ADMIN
 TPCDS100_BNR | ADMIN
(2 rows)

stacktrace of nzpy:

  File "/nz/export/nzscratch_dir/nzbatchbnr_test/nzbatchbnrUtil.py", line 18, in getConn
    return nzpy.connect(user="admin",password="password",host="localhost",port=5480, database=f"{dbname}")
  File "/usr/local/lib/python3.6/site-packages/nzpy/__init__.py", line 50, in connect
    application_name, max_prepared_statements, datestyle, logLevel, tcp_keepalive,char_varchar_encoding, logOptions)
  File "/usr/local/lib/python3.6/site-packages/nzpy/core.py", line 1515, in __init__
    response = hs.startup(database, securityLevel, user, password)
  File "/usr/local/lib/python3.6/site-packages/nzpy/handshake.py", line 96, in startup
    if not self.conn_connection_complete(self._sock.read):
  File "/usr/local/lib/python3.6/site-packages/nzpy/handshake.py", line 527, in conn_connection_complete
    _read(8) # do not use just ignore
  File "/usr/lib64/python3.6/socket.py", line 586, in readinto
    return self._sock.recv_into(b)
  File "/usr/lib64/python3.6/ssl.py", line 971, in recv_into
    return self.read(nbytes, buffer)
  File "/usr/lib64/python3.6/ssl.py", line 833, in read
    return self._sslobj.read(len, buffer)
  File "/usr/lib64/python3.6/ssl.py", line 590, in read
    v = self._sslobj.read(len, buffer)