update docker version in requirements, update configparser logic, fix SocketIO error

Change-Id: I73f2c7aad33091addf2d54cee0ae1eceac3d86a1

Author: qblivion

src/nodemgr/common/docker_containers.py

@@ -25,13 +25,13 @@ def execute(self, id_, line_):
         try:
             # string or stream result works unstable
             # using socket with own read implementation
-            socket = self._client.exec_start(exec_op["Id"], tty=True, socket=True)
+            socket = self._client.exec_start(exec_op["Id"], tty=True, socket=True)._sock
             socket.settimeout(10.0)
             while True:
                 part = socket.recv(1024)
                 if len(part) == 0:
                     break
-                res += part
+                res += str(part)
         finally:
             if socket:
                 # There is cyclic reference there

src/nodemgr/main.py

@@ -14,7 +14,7 @@
 from gevent import monkey
 
 import argparse
-from six.moves.configparser import SafeConfigParser, NoOptionError
+from configparser import SafeConfigParser, NoOptionError
 import gevent
 import os
 import socket
@@ -164,7 +164,7 @@ def main(args_str=' '.join(sys.argv[1:])):
     if (os.path.exists(config_file_path) is False):
         sys.stderr.write("config file '" + config_file_path + "' is not present\n")
         sys.exit(1)
-    config = SafeConfigParser()
+    config = SafeConfigParser(strict=False)
     config.read([config_file_path])
     if 'DEFAULTS' in config.sections():
         default.update(dict(config.items('DEFAULTS')))

src/nodemgr/requirements.txt

@@ -8,5 +8,5 @@ sandesh==0.1dev
 sandesh-common
 grpcio==1.29.0
 protobuf==3.17.3
-docker<3.0.0
+docker<=3.0.0
 containerd==1.5.2