feat(csit): start daily perf jobs earlier

feat(csit): start daily perf jobs earlier

Daily performance jobs are using the same pool of performance testbeds
as manual performance verify jobs (both csit-vpp and vpp-csit).

Most folks who trigger larger numbers of performance verify jobs
are working in Europe timezones.
Thus, the optimal time to start daily performance jobs
is just when Europe is no longer expected to be working.

Daylight saving time conventions complicate the matter,
byt from my point of view 22:30 UTC each day before a workday
seems to be the best.

This Change does not affect weekly jobs nor device jobs.
All daily jobs are still started all at once.

Change-Id: I77c91a76240e2edbf20730254fa0dc7fd102ca7e
Signed-off-by: Vratko Polak <vrpolak@cisco.com>