Vendor dockerpty at c8b493553477c9a57d163c71c97b2102f44a6ce7

Include TLS fixes and relative imports:

c8b4935534

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

fig/packages/dockerpty/__init__.py

@@ -0,0 +1,27 @@
+# dockerpty.
+#
+# Copyright 2014 Chris Corbyn <chris@w3style.co.uk>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from .pty import PseudoTerminal
+
+
+def start(client, container):
+    """
+    Present the PTY of the container inside the current process.
+
+    This is just a wrapper for PseudoTerminal(client, container).start()
+    """
+
+    PseudoTerminal(client, container).start()