tests: Fix up identity-list tests
tests: Fix up identity-list tests

* The test was assuming that the kvstore still knew about an identity from a previous test
* Do not depend on the exact formatting of the CLI

Signed-off-by: Thomas Graf <5f50a84c1fa3bcff146405017f36aec1a10a9e38@cilium.io>

eloycoto/cilium,scanf/cilium,scanf/cilium,cilium/cilium,scanf/cilium,eloycoto/cilium,tklauser/cilium,eloycoto/cilium,cilium-team/cilium,tgraf/cilium,eloycoto/cilium,tklauser/cilium,tgraf/cilium,cilium/cilium,cilium/cilium,michi-covalent/cilium,tklauser/cilium,scanf/cilium,michi-covalent/cilium,cilium-team/cilium,tklauser/cilium,eloycoto/cilium,tklauser/cilium,scanf/cilium,scanf/cilium,michi-covalent/cilium,tgraf/cilium,scanf/cilium,tgraf/cilium,cilium/cilium,tgraf/cilium,eloycoto/cilium,tgraf/cilium,eloycoto/cilium,michi-covalent/cilium,michi-covalent/cilium,cilium/cilium