Switch to Postgres when running tests and turn off the fsync setting (#13678)

* Run all tests fasts in postgres

* Moving postgres config to a file

* Addressing PR review comments

* Testing against mysql in the CI to keep things less changed

* Revert "Testing against mysql in the CI to keep things less changed"

This reverts commit fc940c111db269a821c54e005d76df87cb70e031.

* Fixing a test broken in postgres but working in mysql

* Fixing some tests

* Fixing some config tests with postgres

* Fixing the rest of config tests

* Fixing govet error

* Fixing search tests for postgres

store/sqlstore/supplier.go

@@ -913,7 +913,6 @@ func (ss *SqlSupplier) GetAllConns() []*gorp.DbMap {
 }
 
 func (ss *SqlSupplier) Close() {
-	mlog.Info("Closing SqlStore")
 	ss.master.Db.Close()
 	for _, replica := range ss.replicas {
 		replica.Db.Close()