==== CL 18351 ====
@CHANGE: background helper thread improvements
* limit the number of workers that are potentially recontacted by the background helper routine to 50 per iteration.
* background thread exits and refreshes after running for approximately 1 hour, as opposed to 24 hours
ZD: 17124
@RELNOTES:NO
TODO: these values are hardcode (50, 1 hour)-- make them configurable parameters.
==== CL 18221 ====
@FIX: prevent "host.processors" to be unset when jobs are modified.
JIRA: QUBE-2649
==== CL 18147 ====
@FIX: Windows worker wouldn't properly release automounted drives at the end of running a job instance
ZD: 17400
==== CL 18001 ====
@FIX: Pytnon API's qb.ping(asDict=True) was broken when metered licensing was unauthorized, because of the minus sign