Changes to support refactor in frappe pg-poc branch (#15287)

* Remove quotes from sql to make it compatible with postgres as well

* Fix queries
- Replace mysql specifc queries with standard ones

* Make repo URL chages to test pg-poc

* Add root passowrd to test site config

* Fix quotes issue

* Remove debug flag from a pricing rule query

* Remove python 3.6 version from travis.yml

* Fix improper query issue

* Fix incorrect query

* Fix a query

- This fix need to be changed when we will  start supporting postgres
since date_format is not supported by postgres

* Get price list map as dict

* Convert price_list_currency_map to dict

erpnext/controllers/item_variant.py

@@ -119,7 +119,7 @@ def get_attribute_values(item):
 	return frappe.flags.attribute_values, frappe.flags.numeric_values
 
 def find_variant(template, args, variant_item_code=None):
-	conditions = ["""(iv_attribute.attribute="{0}" and iv_attribute.attribute_value="{1}")"""\
+	conditions = ["""(iv_attribute.attribute={0} and iv_attribute.attribute_value={1})"""\
 		.format(frappe.db.escape(key), frappe.db.escape(cstr(value))) for key, value in args.items()]
 
 	conditions = " or ".join(conditions)