Use re.search instead of re.match

Some web sites have buggy utf8 encoding or not use utf8.
We don't have to be strict, we want a wide coverage.

A bug was introduced by sorting the cache content. Resulting of destroying
the cache object and replace it with a simple dict with no saving.

- Support upgrade
- Refactorise code

python modules have been splitted out from systemd main git tree

Since last major update, a package failure stops the whole sync.
If a package check fails, skip it

Instead of an int vs str error

It's basically a report with a call to sync

Static files are now under a directory in xdg directories (config or cache)

New paths:
$XDG_CONFIG/packages.conf
$XDG_CONFIG/sendmail.conf
$XDG_CACHE/packages.conf

Doesn't compare versions, let that to new mode

KISS++