Show databases and tables for knex

Mysql only.

ussage

let parseUri=require("dburi2config");

let config=parseUri("mysql://root@localhost:3306/sakila?encrypt=true&param1=value1");

//console.log(config);
var knex = require('knex')({
  client: "mysql",
  connection: config
});

let listTablesAsync=require("../index").listTablesAsync;
let listDatabasesAsync=require("../index").listDatabasesAsync;


listTablesAsync(knex).then((rst)=>{
   console.log("databases",rst);
})