third_party/py: remove flask-oauthlib

This fixes resolution errors with newer pip versions (where
flask-oauthlib wants to pull in oauthlib==2 while requests-oauthlib
wants to pull in oauthlib==3).

We remove flask-oauthlib fully, as it's abandoned. Our copy of
flask-spaceauth (//hswaw/lib/flask_spaceauth) depends on it, but we will
update it to use authlib instead.

Change-Id: I51a9336015ddc0cad7457844d186bd8408371ab3

third_party/py/requirements.txt

@@ -15,7 +15,6 @@ Django==2.2.3
 fabric==2.4.0
 Flask==1.1.1
 Flask-Login==0.4.1
-Flask-OAuthlib==0.9.5
 Flask-SQLAlchemy==2.4.0
 Flask-WTF==0.14.2
 future==0.17.1
@@ -27,13 +26,13 @@ invoke==1.2.0
 itsdangerous==1.1.0
 Jinja2==2.10.1
 MarkupSafe==1.1.1
-oauthlib==2.1.0
+oauthlib==3.1.1
 paramiko==2.4.2
 psycopg2==2.8.5
 pyasn1==0.4.5
 pycparser==2.19
-PyNaCl==1.3.0
 pyelftools==0.26
+PyNaCl==1.3.0
 python-dateutil==2.8.0
 pytz==2019.1
 requests==2.22.0
@@ -44,3 +43,5 @@ sqlparse==0.3.0
 urllib3==1.25.3
 Werkzeug==0.15.5
 WTForms==2.2.1
+zope.event==4.5.0
+zope.interface==5.4.0