[Wisp] Fix PassTokenTest

[yuleil]

Summary: There is an unlocked time window between pass token and notify
next, causing the test to occasionally fail.

Test Plan: PassTokenTest

Reviewed-by: D-D-H, joeylee97

Issue: dragonwell-project/dragonwell8#290

[D-D-H]

LGTM.

Please update the copyright year.

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