Add the files required by the tests.

Somehow they got removed with all the moving and merging.
Especially kernelcrash.txt is required for t1.pl
Make sure the fileid are saved to the database when upgrading from owncloud5 to owncloud6

We fetch the id from the server, but don't save them in the database.

I Could have used INSTRUCTION_UPDATED for that, but then i would need to update the
reconcile algorithm to take in account the fact that UPDATED is possible there.

Instead, use should_update_etag  which means the db is going to be written again

Remove reference to old instruction _UPDATED and _DELETED which does not make sens with
the new propagator

Improve the test to test this case,  and that etags are properly writen to the DB
when there is a fake conflict