rules_pip: update to new version

rules_pip has a new version [1] of their rule system, incompatible with the
version we used, that fixes a bunch of issues, notably:
 - explicit tagging of repositories for PY2/PY3/PY23 support
 - removal of dependency on host pip (in exchange for having to vendor
   wheels)
 - higher quality tooling for locking

We update to the newer version of pip_rules, rename the external
repository to pydeps and move requirements.txt, the lockfile and the
newly vendored wheels to third_party/, where they belong.

[1] - https://github.com/apt-itude/rules_pip/issues/16

Change-Id: I1065ee2fc410e52fca2be89fcbdd4cc5a4755d55
diff --git a/third_party/py/requirements.txt b/third_party/py/requirements.txt
new file mode 100644
index 0000000..3722ff7
--- /dev/null
+++ b/third_party/py/requirements.txt
@@ -0,0 +1,36 @@
+arrow==0.14.5
+asn1crypto==0.24.0
+bcrypt==3.1.5
+certifi==2019.6.16
+cffi==1.11.5
+chardet==3.0.4
+Click==7.0
+cryptography==2.4.2
+django==2.2.3
+fabric==2.4.0
+Flask==1.1.1
+Flask-SQLAlchemy==2.4.0
+future==0.17.1
+gevent==1.4.0
+greenlet==0.4.15
+grpcio==1.22.0
+gunicorn==19.9.0
+idna==2.8
+invoke==1.2.0
+itsdangerous==1.1.0
+Jinja2==2.10.1
+MarkupSafe==1.1.1
+paramiko==2.4.2
+protobuf==3.9.0
+pyasn1==0.4.5
+pycparser==2.19
+PyNaCl==1.3.0
+python-dateutil==2.8.0
+pytz==2019.1
+requests==2.22.0
+six==1.12.0
+SQLAlchemy==1.3.8
+sqlparse==0.3.0
+urllib3==1.25.3
+uWSGI==2.0.18
+Werkzeug==0.15.5