Backport of upstream patch to address
https://bugs.launchpad.net/horizon/+bug/1600062
The fix first appears in newton-2.

fixed by Change-Id:  I45a4097413e8e5154350459d15e2f45b61f811a8

commit fc02a0207da0f3bdfce023789009fc2c529a5bee
Author: [email protected] <[email protected]>
Date:   Fri Jul 8 00:25:30 2016 +0000

    Modify "Edit Flavor" action

    Reproduce:
    1 Open Admin/Flavors
    2 Click "Edit Flavor" in the table list actions

    Expected result:
    Open "Flavor Information" tab.

    Actual result:
    Open "Flavor Access" tab.

    Change-Id: I45a4097413e8e5154350459d15e2f45b61f811a8
    Closes-Bug: #1600062

--- horizon-9.0.1/openstack_dashboard/dashboards/admin/flavors/tables.py.orig	2016-09-16 10:28:54.006726137 +0000
+++ horizon-9.0.1/openstack_dashboard/dashboards/admin/flavors/tables.py	2016-09-16 10:29:38.550645259 +0000
@@ -64,6 +64,12 @@ class UpdateFlavor(tables.LinkAction):
     classes = ("ajax-modal",)
     icon = "pencil"
 
+    def get_link_url(self, flavor):
+        step = 'update_info'
+        base_url = reverse(self.url, args=[flavor.id])
+        param = urlencode({"step": step})
+        return "?".join([base_url, param])
+
 
 class UpdateMetadata(tables.LinkAction):
     name = "update_metadata"