definable end point for sales orders, and drafts

Needs tweaking, but sales orders can now be generated to a given end date.
Drafts too can be given a date, but also a datetime.

Sales orders defaut time to midnight the night before, while drafts
default to now, but can be given other end dates.

Change-Id: Id70227650c765bb477934ffa24ad5d4b99fc34e9

client/client.py

@@ -23,14 +23,14 @@ class Client(object):
         except ConnectionError as e:
             print e
 
-    def sales_order(self, tenants, draft):
+    def sales_order(self, tenants, end, draft):
         if draft:
             url = self.endpoint + "sales_draft"
         else:
             url = self.endpoint + "sales_order"
 
         for tenant in tenants:
-            data = {"tenant": tenant}
+            data = {"tenant": tenant, 'end': end}
             try:
                 response = requests.post(url,
                                          headers={"Content-Type":