Refactor action target names Host-start-stop

The target change is:
obmc-chassis-stop -> obmc-host-stop
obmc-chassis-start -> obmc-host-start

Change-Id: I70fc0af68c9b493231aa9e4e698d33ae9d57cfc4
Signed-off-by: Josh D. King <jdking@us.ibm.com>
diff --git a/host_state_manager.cpp b/host_state_manager.cpp
index 5b1e03b..3eb76b9 100644
--- a/host_state_manager.cpp
+++ b/host_state_manager.cpp
@@ -18,8 +18,8 @@
 
 using namespace phosphor::logging;
 
-constexpr auto HOST_STATE_POWEROFF_TGT = "obmc-chassis-stop@0.target";
-constexpr auto HOST_STATE_POWERON_TGT = "obmc-chassis-start@0.target";
+constexpr auto HOST_STATE_POWEROFF_TGT = "obmc-host-stop@0.target";
+constexpr auto HOST_STATE_POWERON_TGT = "obmc-host-start@0.target";
 constexpr auto HOST_STATE_QUIESCE_TGT = "obmc-quiesce-host@0.target";
 
 /* Map a transition to it's systemd target */