Revert "add session redis configuration"

This reverts commit 5e1dc840.

app.py

@@ -23,7 +23,6 @@ client = MongoClient(host=config.MONGO['host'])
 
 app.secret_key = config.SECRET_KEY
 app.config['SESSION_TYPE'] = 'redis'
-app.config['SESSION_REDIS'] = config.SESSION_REDIS
 app.cache = Cache(app, config=config.REDIS)
 sess = Session()
 sess.init_app(app)

config.example.py

@@ -22,7 +22,7 @@ MONGO = {
     'database': 'taiko'
 }
 
-# Redis server settings, used for cache.
+# Redis server settings, used for sessions + cache.
 REDIS = {
     'CACHE_TYPE': 'redis',
     'CACHE_REDIS_HOST': '127.0.0.1',
@@ -31,9 +31,6 @@ REDIS = {
     'CACHE_REDIS_DB': None
 }
 
-# Redis server url for session.
-SESSION_REDIS = 'redis://localhost:6379'
-
 # Secret key used for sessions.
 SECRET_KEY = 'change-me'