weblinkchecker.py : XML and archived URL

Same as the follow for compat:
* I7ba4f460897316ae1f5cbcca0080f8c3262d9abf : read XML dump
* I46c1737aea471691cd90f9ec21e3592ce0c69fde : Internet Archive and Web Citation

Bug: 55039
Bug: 58815
Change-Id: I7279da01b0527c974ea53dc1f234a9268dbc8d43
Merge "weblinkchecker.py : XML and archived URL"