bpo-33131: Upgrade ensurepip to bundle pip 10.0.1 (GH-6546)

Upgrade ensurepip to bundle pip 10.0.1
diff --git a/Lib/ensurepip/__init__.py b/Lib/ensurepip/__init__.py
index 4a5b058..8dc2354 100644
--- a/Lib/ensurepip/__init__.py
+++ b/Lib/ensurepip/__init__.py
@@ -10,7 +10,7 @@
 
 _SETUPTOOLS_VERSION = "39.0.1"
 
-_PIP_VERSION = "9.0.3"
+_PIP_VERSION = "10.0.1"
 
 _PROJECTS = [
     ("setuptools", _SETUPTOOLS_VERSION),
@@ -24,8 +24,8 @@
         sys.path = additional_paths + sys.path
 
     # Install the bundled software
-    import pip
-    return pip.main(args)
+    import pip._internal
+    return pip._internal.main(args)
 
 
 def version():
diff --git a/Lib/ensurepip/_bundled/pip-10.0.1-py2.py3-none-any.whl b/Lib/ensurepip/_bundled/pip-10.0.1-py2.py3-none-any.whl
new file mode 100644
index 0000000..9837092
--- /dev/null
+++ b/Lib/ensurepip/_bundled/pip-10.0.1-py2.py3-none-any.whl
Binary files differ
diff --git a/Lib/ensurepip/_bundled/pip-9.0.3-py2.py3-none-any.whl b/Lib/ensurepip/_bundled/pip-9.0.3-py2.py3-none-any.whl
deleted file mode 100644
index 5d33bba..0000000
--- a/Lib/ensurepip/_bundled/pip-9.0.3-py2.py3-none-any.whl
+++ /dev/null
Binary files differ
diff --git a/Misc/NEWS.d/next/Library/2018-04-20-10-43-17.bpo-33131.L2E977.rst b/Misc/NEWS.d/next/Library/2018-04-20-10-43-17.bpo-33131.L2E977.rst
new file mode 100644
index 0000000..875c6ac
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2018-04-20-10-43-17.bpo-33131.L2E977.rst
@@ -0,0 +1 @@
+Upgrade bundled version of pip to 10.0.1.