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

travis/bench_init.sh

@@ -1,8 +1,8 @@
 #!/bin/bash
 
 cd ~/
-curl -I https://github.com/frappe/frappe/tree/$TRAVIS_BRANCH | head -n 1 | cut -d $' ' -f2 | (
+curl -I https://github.com/surajshetty3416/frappe/tree/pg-poc | head -n 1 | cut -d $' ' -f2 | (
 	read response;
-	[ $response == '200' ] && branch=$TRAVIS_BRANCH || branch='develop';
-	bench init frappe-bench --frappe-path https://github.com/frappe/frappe.git --frappe-branch $branch --python $(which python)
+	[ $response == '200' ] && branch='pg-poc' || branch='develop';
+	bench init frappe-bench --frappe-path https://github.com/surajshetty3416/frappe.git --frappe-branch $branch --python $(which python)
 )