Update performance test timing for warmup

Incorrect limit on the warmup results in performance pipeline
failing, as the first test that runs must include the time taken
to write initial data.

Issue-ID: CPS-1811
Signed-off-by: danielhanrahan <daniel.hanrahan@est.tech>
Change-Id: I82353fcd5d0904f458808b32f4f01597ba25a688
2 files changed