allow openstack fields to contain null/blank values. separate User.is_admin from User.is_staff. expose User.is_admin on mdole admin form
diff --git a/plstackapi/core/models/site.py b/plstackapi/core/models/site.py
index f23ef3f..cba70f4 100644
--- a/plstackapi/core/models/site.py
+++ b/plstackapi/core/models/site.py
@@ -6,7 +6,7 @@
 
 class Site(PlCoreBase):
 
-    tenant_id = models.CharField(max_length=200, help_text="Keystone tenant id")
+    tenant_id = models.CharField(null=True, blank=True, max_length=200, help_text="Keystone tenant id")
     name = models.CharField(max_length=200, help_text="Name for this Site")
     site_url = models.URLField(null=True, blank=True, max_length=512, help_text="Site's Home URL Page")
     enabled = models.BooleanField(default=True, help_text="Status for this Site")