Switch to new KeyChain where possible

signed_interest::POS_RANDOM_VAL and signed_interest::POS_TIMESTAMP
constants are deprecated. Use command_interest:: equivalents instead.

This commit also includes fix for the backward compatibility regression
due to move of deprecated TPM/PublicInfo header files.

Change-Id: Ic3b008fc6758f3ac83f191158b6ac0789483f90d
Refs: #3098
diff --git a/tests/unit-tests/util/segment-fetcher.t.cpp b/tests/unit-tests/util/segment-fetcher.t.cpp
index 02ef85b..6d9ea36 100644
--- a/tests/unit-tests/util/segment-fetcher.t.cpp
+++ b/tests/unit-tests/util/segment-fetcher.t.cpp
@@ -40,7 +40,7 @@
 BOOST_AUTO_TEST_SUITE(Util)
 BOOST_AUTO_TEST_SUITE(TestSegmentFetcher)
 
-class Fixture : public IdentityManagementTimeFixture
+class Fixture : public IdentityManagementV1TimeFixture
 {
 public:
   Fixture()