change systemd signal handler to be more specific

Future commits will utilize a new signal handler looking at different
systemd signals so make the existing one more specific.

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Change-Id: I97da05919b90bba3e2fe512d45767ad4f7e1bfff
diff --git a/host_state_manager.cpp b/host_state_manager.cpp
index 049c2cc..d9b0319 100644
--- a/host_state_manager.cpp
+++ b/host_state_manager.cpp
@@ -231,7 +231,7 @@
     }
 }
 
-void Host::sysStateChange(sdbusplus::message::message& msg)
+void Host::sysStateChangeJobRemoved(sdbusplus::message::message& msg)
 {
     uint32_t newStateID{};
     sdbusplus::message::object_path newStateObjPath;