[ADD] product_contract: Create module

* Add contract functionality to `product.templates`
* Add logic to create contracts from `sale.order` that contains contract products.

product_contract/models/sale_order.py

@@ -0,0 +1,27 @@
+# -*- coding: utf-8 -*-
+# Copyright 2017 LasLabs Inc.
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from odoo import api, models
+
+
+class SaleOrder(models.Model):
+    _inherit = 'sale.order'
+
+    @api.multi
+    def action_confirm(self):
+        """ If we have a contract in the order, set it up """
+        for rec in self:
+            order_lines = self.mapped('order_line').filtered(
+                lambda r: r.product_id.is_contract
+            )
+            for line in order_lines:
+                contract_tmpl = line.product_id.contract_template_id
+                contract = self.env['account.analytic.account'].create({
+                    'name': '%s Contract' % rec.name,
+                    'partner_id': rec.partner_id.id,
+                    'contract_template_id': contract_tmpl.id,
+                })
+                line.contract_id = contract.id
+                contract.recurring_create_invoice()
+        return super(SaleOrder, self).action_confirm()