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/startup/boot.py

@@ -26,11 +26,12 @@ def boot_session(bootinfo):
 			'default_valid_till'))
 
 		# if no company, show a dialog box to create a new company
-		bootinfo.customer_count = frappe.db.sql("""select count(*) from tabCustomer""")[0][0]
+		bootinfo.customer_count = frappe.db.sql("""SELECT count(*) FROM `tabCustomer`""")[0][0]
 
 		if not bootinfo.customer_count:
-			bootinfo.setup_complete = frappe.db.sql("""select name from
-				tabCompany limit 1""") and 'Yes' or 'No'
+			bootinfo.setup_complete = frappe.db.sql("""SELECT `name`
+				FROM `tabCompany`
+				LIMIT 1""") and 'Yes' or 'No'
 
 		bootinfo.docs += frappe.db.sql("""select name, default_currency, cost_center, default_terms,
 			default_letter_head, default_bank_account, enable_perpetual_inventory from `tabCompany`""",