timedhosts: fix file:// profiling.  BZ 822632.
timedhosts: fix file:// profiling.  BZ 822632.

- Do not profile absolute file:// URLs.
- Give a hint to _TH.update() which baseurl was used
  so we may profile file:// mirrors, too.
- Strip username and password from stored hostnames.

Distrotech/urlgrabber,Distrotech/urlgrabber,oe-lite/urlgrabber,oe-lite/urlgrabber,henrysher/urlgrabber,henrysher/urlgrabber,tradej/urlgrabber,tradej/urlgrabber,oe-lite/urlgrabber,tradej/urlgrabber,oe-lite/urlgrabber,henrysher/urlgrabber,henrysher/urlgrabber,Distrotech/urlgrabber,Distrotech/urlgrabber