add handler logic to handle SysPsuHardReset

Add handler logic to handler for SysPsuHardReset such that it splits the
true IPMI processing from the business logic.

Tested: Only ran unit-tests (added new ones).
Change-Id: Id5dae85cbc54db7dee3cb5e62ed80c77ff3d5719
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/test/handler_mock.hpp b/test/handler_mock.hpp
index a92606a..6eb929a 100644
--- a/test/handler_mock.hpp
+++ b/test/handler_mock.hpp
@@ -20,6 +20,7 @@
     MOCK_CONST_METHOD1(getCpldVersion,
                        std::tuple<std::uint8_t, std::uint8_t, std::uint8_t,
                                   std::uint8_t>(unsigned int));
+    MOCK_CONST_METHOD1(psuResetDelay, void(std::uint32_t));
 };
 
 } // namespace ipmi