[api] ignore indices files for coverage

They are config files really
[backend][api] drop BUILD_UNCHANGED event

 90% of our events are "build unchanged" and we have zero subscribers
add $BSConfig::workerpartitionservers

Currently evaluated in scheduler, should be read and transmitted
by the src server in the future.
[backend] delete no longer needed line
[backend][api] drop BUILD_UNCHANGED event

 90% of our events are "build unchanged" and we have zero subscribers
[api] fake issue servers using webmock

Fetching fate issues seems to be a stub ;(
[dist] update gem versions
[api] move the ldap code from user model to a class of its own

It has unfortunately 0 coverage, so I can't test it - but at
least I can filter it out and make sure the rest is covered well
[api] really test delayed jobs
[api][webui] notifications for new comments now being sent out to hermes