[FAB-14916] idemix test flake
[FAB-14916] idemix test flake

The change-set ensures that the credential
is propertly invalidated.

Change-Id: I2b486048fb3267001658b80a73c433a0e7018ff1
Signed-off-by: Angelo De Caro <aa3159afc1d353ecf7d91cbd242724ce1f99d443@zurich.ibm.com>

manish-sethi/fabric-sidedb,manish-sethi/fabric-sidedb,manish-sethi/fabric-sidedb,stemlending/fabric,binhn/fabric,stemlending/fabric,hyperledger/fabric,jimthematrix/fabric,stemlending/fabric,manish-sethi/fabric-sidedb,binhn/fabric,manish-sethi/fabric,jimthematrix/fabric,manish-sethi/fabric-sidedb,manish-sethi/fabric,muralisrini/fabric,muralisrini/fabric,binhn/fabric,manish-sethi/fabric-sidedb,muralisrini/fabric,hyperledger/fabric,stemlending/fabric,manish-sethi/fabric-sidedb