Dashboard Ignores `SF_DB_HOST` Env

[ax3l]

For local testing with SSH tunnel ssh -L 27017:mongodb05.nersc.gov:27017 dtn-nersc -N to NERSC MongoDB, I need to patch right now:

diff --git a/dashboard/utils.py b/dashboard/utils.py
index ba9971f6b..5fcc4a961 100644
--- a/dashboard/utils.py
+++ b/dashboard/utils.py
@@ -123,7 +123,7 @@ def load_data(db, experiment, date_range=None):
 def load_database(config_dict):
     print("Loading database...")
     # read database information from configuration dictionary
-    db_host = config_dict["database"]["host"]
+    db_host = "127.0.0.1"  # config_dict["database"]["host"]
     db_port = config_dict["database"]["port"]
     db_name = config_dict["database"]["name"]
     db_auth = config_dict["database"]["auth"]

because export SF_DB_HOST='127.0.0.1' is over-written by config files of the experiment.

We need to reintroduce this env var check again, to enable remote development (offsite from LBNL campus).