mgmt: change strategy-choice/set response codes

If the specified strategy name cannot be instantiated,
respond with 404 status code.

refs #3868

Change-Id: I8275923f149ec9c2ed82e485e933d16320bd3a03
diff --git a/tests/daemon/mgmt/strategy-choice-manager.t.cpp b/tests/daemon/mgmt/strategy-choice-manager.t.cpp
index f1121ea..93c3080 100644
--- a/tests/daemon/mgmt/strategy-choice-manager.t.cpp
+++ b/tests/daemon/mgmt/strategy-choice-manager.t.cpp
@@ -80,7 +80,7 @@
 BOOST_FIXTURE_TEST_SUITE(TestStrategyChoiceManager, StrategyChoiceManagerFixture)
 
 ///\todo #3868 rewrite test case after changing strategy versioning scheme
-BOOST_AUTO_TEST_CASE_EXPECTED_FAILURES(SetStrategy, 6)
+BOOST_AUTO_TEST_CASE_EXPECTED_FAILURES(SetStrategy, 7)
 BOOST_AUTO_TEST_CASE(SetStrategy)
 {
   auto testSetStrategy = [this] (const ControlParameters& parameters) -> Name {