Correct display of project/tenant id on display of credentials

This change corrects the display of ec2 credentails within the
ListEC2Creds method. Added explicit headers and corrected data listt o
specify tenant_id instead of project id.

Change-Id: I2ea579082bee800d774f202bdc38e2d546e57e77
Closes-Bug: #1292337

Author: wchrisjohnson

openstackclient/identity/v2_0/ec2creds.py

@@ -135,9 +135,11 @@ def take_action(self, parsed_args):
             # Get the user from the current auth
             user = identity_client.auth_user_id
 
-        columns = ('Access', 'Secret', 'Project ID', 'User ID')
+        columns = ('access', 'secret', 'tenant_id', 'user_id')
+        column_headers = ('Access', 'Secret', 'Project ID', 'User ID')
         data = identity_client.ec2.list(user)
-        return (columns,
+
+        return (column_headers,
                 (utils.get_item_properties(
                     s, columns,
                     formatters={},