Move ssladapter to transport module

Signed-off-by: Joffrey F <joffrey@docker.com>

docker/api/client.py

@@ -17,7 +17,7 @@ from .network import NetworkApiMixin
 from .service import ServiceApiMixin
 from .swarm import SwarmApiMixin
 from .volume import VolumeApiMixin
-from .. import auth, ssladapter
+from .. import auth
 from ..constants import (DEFAULT_TIMEOUT_SECONDS, DEFAULT_USER_AGENT,
                          IS_WINDOWS_PLATFORM, DEFAULT_DOCKER_API_VERSION,
                          STREAM_HEADER_SIZE_BYTES, DEFAULT_NUM_POOLS,
@@ -25,7 +25,7 @@ from ..constants import (DEFAULT_TIMEOUT_SECONDS, DEFAULT_USER_AGENT,
 from ..errors import (DockerException, TLSParameterError,
                       create_api_error_from_http_exception)
 from ..tls import TLSConfig
-from ..transport import UnixAdapter
+from ..transport import SSLAdapter, UnixAdapter
 from ..utils import utils, check_resource, update_headers
 from ..utils.socket import frames_iter
 try:
@@ -121,9 +121,7 @@ class APIClient(
             if isinstance(tls, TLSConfig):
                 tls.configure_client(self)
             elif tls:
-                self._custom_adapter = ssladapter.SSLAdapter(
-                    pool_connections=num_pools
-                )
+                self._custom_adapter = SSLAdapter(pool_connections=num_pools)
                 self.mount('https://', self._custom_adapter)
             self.base_url = base_url
 

docker/tls.py

 import os
 import ssl
 
-from . import errors, ssladapter
+from . import errors
+from .transport import SSLAdapter
 
 
 class TLSConfig(object):
@@ -84,7 +85,7 @@ class TLSConfig(object):
         if self.cert:
             client.cert = self.cert
 
-        client.mount('https://', ssladapter.SSLAdapter(
+        client.mount('https://', SSLAdapter(
             ssl_version=self.ssl_version,
             assert_hostname=self.assert_hostname,
             assert_fingerprint=self.assert_fingerprint,

docker/transport/__init__.py

 # flake8: noqa
 from .unixconn import UnixAdapter
+from .ssladapter import SSLAdapter
 try:
     from .npipeconn import NpipeAdapter
     from .npipesocket import NpipeSocket

tests/unit/ssladapter_test.py

 import unittest
-from docker import ssladapter
+from docker.transport import ssladapter
 
 try:
     from backports.ssl_match_hostname import (