devmon: re-evaluate device conditions on reconf

Device conditions tracked by devmon were lost on `initctl reload`
because the reconf path did not re-assert them.  Add devmon_reconf()
to iterate all tracked device nodes and set or clear their conditions
based on current device presence.

Signed-off-by: Mattias Walström <lazzer@gmail.com>

src/sm.c

@@ -32,6 +32,7 @@
 #include "cgroup.h"
 #include "cond.h"
 #include "conf.h"
+#include "devmon.h"
 #include "log.h"
 #include "helpers.h"
 #include "private.h"
@@ -515,6 +516,9 @@ restart:
 		dbg("Calling reconf hooks ...");
 		plugin_run_hooks(HOOK_SVC_RECONF);
 
+		dbg("Update configuration generation of device conditions ...");
+		devmon_reconf();
+
 		dbg("Update configuration generation of unmodified non-native services ...");
 		service_notify_reconf();