Support encode form of baseurl for repo directive.

Support encode form of baseurl for repo directive.

If user has special characters like '@' in his/her password, it
can be write as encode form embeded into url. By using zypp.Url
class which is already support encoded password, it by default
hide password part, so we also gain the feature that password
won't be printed to console.

Fix: 1499

Change-Id: I4243f36df491cb6eb80f04334962a2ed6030acbe