Create objects for existing logs on startup

Use getManagedObjects to find the existing error log
entries, and grab their Logging.Entry property map
to pass to the create function.

Change-Id: I798f13422483fdeea16a5acf54d31919f1c7c096
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/configure.ac b/configure.ac
index 6c88d68..cf833f6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -27,6 +27,8 @@
           [The xyz log manager DBus object path])
 AC_DEFINE(LOGGING_IFACE, "xyz.openbmc_project.Logging.Entry",
           [The xyz log entry interface])
+AC_DEFINE(LOGGING_BUSNAME, "xyz.openbmc_project.Logging",
+          [The xyz logging busname])
 
 AC_CONFIG_FILES([Makefile])
 AC_OUTPUT