tests: Implement IdentityManagementV2Fixture for v2::KeyChain

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
diff --git a/tests/integrated/face.cpp b/tests/integrated/face.cpp
index 799a562..9d358a5 100644
--- a/tests/integrated/face.cpp
+++ b/tests/integrated/face.cpp
@@ -28,7 +28,6 @@
 
 #include "identity-management-fixture.hpp"
 #include "boost-test.hpp"
-#include "key-chain-fixture.hpp"
 
 #include <stdio.h>
 
@@ -40,8 +39,7 @@
   const std::string PATH = "build/keys-with-default-tpm";
 };
 
-class FacesFixture : public IdentityManagementFixture,
-                     public PibDirFixture<PibDirWithDefaultTpm>
+class FacesFixture : public IdentityManagementFixture
 {
 public:
   FacesFixture()