Remove duplicated methods from container.py

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>

docker/client.py

@@ -32,6 +32,7 @@ from .ssladapter import ssladapter
 from .tls import TLSConfig
 from .transport import UnixAdapter
 from .utils import utils, check_resource, update_headers, kwargs_from_env
+from .utils.socket import read_socket, next_packet_size
 try:
     from .transport import NpipeAdapter
 except ImportError:
@@ -309,37 +310,6 @@ class Client(
             yield out
 
     def _read_from_socket(self, response, stream):
-        def read_socket(socket, n=4096):
-            recoverable_errors = (
-                errno.EINTR, errno.EDEADLK, errno.EWOULDBLOCK
-            )
-
-            # wait for data to become available
-            select.select([socket], [], [])
-
-            try:
-                if hasattr(socket, 'recv'):
-                    return socket.recv(n)
-                return os.read(socket.fileno(), n)
-            except EnvironmentError as e:
-                if e.errno not in recoverable_errors:
-                    raise
-
-        def next_packet_size(socket):
-            data = six.binary_type()
-            while len(data) < 8:
-                next_data = read_socket(socket, 8 - len(data))
-                if not next_data:
-                    return 0
-                data = data + next_data
-
-            if data is None:
-                return 0
-
-            if len(data) == 8:
-                _, actual = struct.unpack('>BxxxL', data)
-                return actual
-
         def read_loop(socket):
             n = next_packet_size(socket)
             while n > 0: