This ease the development and version updates

Factor-out things that provide components for ZODB stack from software/neoppod/
into component/ZODB/.

Move versions for eggs that component/{ZEO,pygolang,zodbtools,pytest}
depend on out of component/ and into stack/slapos.cfg

Leave version of component <X> inside component/<X>.

I was asked to do so:

nexedi/slapos!839 (comment 119170)

Going from 0.0.0.dev4 to -> 0.0.0.dev8 zodbtools:

- Stabilized `zodb dump` format and layed ground for `zodb restore`;
- Taught `zodb analyze` to work with any ZODB storage (instead of being
  FileStorage-only tool) and to analyze a particular range of history
  (instead of crunching data for days on a large database);
- Added `zodb commit` tool that is handy in testing;
- Added ability to specify tid ranges in human-readable format, as in
  e.g. `zodb analyze data.fs 2018-01-01T10:30:00Z..yesterday`.
- Progressed on Python3 support.

See https://pypi.org/project/zodbtools/#zodbtools-change-history
for details.

Close to non-functional change, but removes PendingDeprecationWarning
about cgi.parse_qsl