KeyChain::makeCertificate() captures a common routine of creating and
signing a certificate. Having it in the library allows deduplicating
similar code elsewhere.
Also add "find by certificate name" tests for CertificateCache and
TrustAnchorContainer.
refs #5112
Change-Id: I954587e1c03d6b372e3b4f04e702339d1ff1533e
The old IdentityManagementFixture is renamed to IdentityManagementV1Fixture.
This commit also removes global KeyChainFixture, as it doesn't work with
TestKeyChain test suites. Instead, IdentityManagementFixtures are
customizing PIB/TPM modules.
Change-Id: Iadc43b78523cd43bff4f454d6aea2fca8107a650
Refs: #2926