enhance variable reading

registrar_test.py

 import psycopg2
 import os
 
-lines = tuple(open('./env/emg_db.env', 'r'))
 
-for line in lines:
-    variable_key = line.split("=",1)[0]
-    variable = line.split("=",1)[1]
-    if variable_key == "DB_USER" :
-        database_user = variable
-    elif variable_key == "DB_PW" :
-        database_password = variable
-    elif variable_key == "DB_HOST" :
-        host = variable
-    elif variable_key == "DB_PORT" :
-        port = variable
-    elif variable_key == "DB_NAME" :            
-        database = variable
+with open('./env/emg_db.env', 'r') as f:
+    env = dict(
+        line.split('=', 1)
+        for line in f
+    )
+database= env['DB_NAME']
+port = env['DB_PORT']
+host = env['DB_HOST']
+database_password= env['DB_PW']
+database_user = env['DB_USER']
 
 def connect_to_db(eo_id):
     global db_name, coverage_id

requirements.txt

 pytest
 psycopg2
-python-swiftclient
-python-keystoneclient
+# python-swiftclient
+# python-keystoneclient
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