Upgrade cryptography from 2.5 to 3.3

Source code is from https://github.com/pyca/cryptography/tree/3.3.x

Run setup.py locally and rename _openssl.so/_padding.so

Bug: 205265538
Test: None
Change-Id: If031739ef5830ba2fb177add74515e4660e2906e
diff --git a/docs/development/getting-started.rst b/docs/development/getting-started.rst
index cc333e4..1d939a9 100644
--- a/docs/development/getting-started.rst
+++ b/docs/development/getting-started.rst
@@ -81,7 +81,7 @@
     ...
      py27: commands succeeded
     ERROR:   pypy: InterpreterNotFound: pypy
-     py34: commands succeeded
+     py38: commands succeeded
      docs: commands succeeded
      pep8: commands succeeded