gh-1512 "console connect doesn't understand uri with empty passwords"

Review fixes:
* revert changes in console.lua, they should be pushed down to
  net.box (it should accept empty passwords)

src/lua/console.lua

@@ -309,12 +309,6 @@ local function connect(uri)
         error('Usage: console.connect("[login:password@][host:]port")')
     end
 
-    if u.login ~= nil and u.password == nil then
-        -- Not specifying a password means empty password.
-        -- Required for passwordless URI forms like admin@host
-        u.password = ''
-    end
-
     -- connect to remote host
     local remote = require('net.box'):new(u.host, u.service,
         { user = u.login, password = u.password })