Release 1.0.17

* version 1.0.17
* build/CI/packaging: update RPM spec to support RHEL8-beta
(thanks to Alexey Bychko for the patch)
* regression tests: remove unnecessary error leading to
opt_rate.t instability.
* --rate mode: return a non-zero exit code on event queue
overflow.
* --rate mode: fix a bogus error about eventgen thread
termination