Fix scheduler test on postgres
Store distance in dependency
Remove srpm repodata when initializing srpm_cache
Run createrepo automatically in srpm_cache
Totally rework dependency resolution and difference computation
Fix Proxy class
Silence RPM output when downloading
Save Koji subtasks to DB when build completed
Add index on dependency.package_id

This is necessary for the difference query. Without the index it will take more
than 30s per package.
Interpolate repo_id into repo URL in config
Add last_build relationship in addition to last_complete_build
Increase number of calls per multicall

100 seems to be still working well and is noticeably faster than 50
Finish reworking new repo processing
Tests for resolver's new repo generation
Add build processing to resolver

Processing means [re]generating dependency changes against previous build.
It uses repo in which the package was really built, so no more race conditions.
Sync missing data from Koji in migration

Download repo_id, finished time and subtasks for all builds.
Remove log-downloader service

We're don't really use the logs at this time and they take precious space
Add systemd service for resolver