Gossip certStore test fix
Gossip certStore test fix

Test failed on z because scheduling.
Replaced atomic with locking to have better control

Change-Id: I33441151de341df9c031be6d9757f6cae60e1209
Signed-off-by: Yacov Manevich <632344b5da9bd743456189af4db4b56472defb8c@il.ibm.com>

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