[webui] fix rebuildtime for project links
[dist] drop webui db:migrate call in README.UPDATERS
[dist] package emtpy config file for sphinx with right permissions
[api] better Sphinx management in clockwork
[backend] use BSSolv::thawcache if available
[dist] move /srv/obs creation to posttrans

this fixes hopefully the missing /srv/obs on appliances
[api] More robust and delayed Sphinx indexing for clockwork
[backend] remove unused cbinstall/cbpreinstall code
[dist] require new perl-BSSolv-0.19.0

avoid old and unsecure implementation for interconnect
[dist] fix worker startup

for some reasons repserver are not answering directly after startup when
using systemd.
[backend] add new files and structures since OBS 2.5 in bs_fsck
[backend] test run of bs_check_consistency at the end of test suite
[backend] ignore signing errors on travis
[backend] catch missing shortsummary definitions early
[backend] fix remote view=info for source packages
[backend] implement --fix options in bs_check
[backend] support fetching project _result from remote
[backend] move and fix interconnect test case
[dist] add a note how to fix searchd for non-appliance users
[api] forbid creation of set_bugowner action without person and group