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/shopping_cart/doctype/shopping_cart_settings/shopping_cart_settings.py

@@ -28,9 +28,10 @@ class ShoppingCartSettings(Document):
 				raise_exception=ShoppingCartSetupError)
 
 		price_list_currency_map = frappe.db.get_values("Price List",
-			[self.price_list],
-			"currency")
+			[self.price_list], "currency")
 
+		price_list_currency_map = dict(price_list_currency_map)
+		
 		# check if all price lists have a currency
 		for price_list, currency in price_list_currency_map.items():
 			if not currency:
@@ -39,8 +40,8 @@ class ShoppingCartSettings(Document):
 		expected_to_exist = [currency + "-" + company_currency
 			for currency in price_list_currency_map.values()
 			if currency != company_currency]
-		
-		# manqala 20/09/2016: set up selection parameters for query from tabCurrency Exchange	
+
+		# manqala 20/09/2016: set up selection parameters for query from tabCurrency Exchange
 		from_currency = [currency for currency in price_list_currency_map.values() if currency != company_currency]
 		to_currency = company_currency
 		# manqala end