tmpfiles: refactor into separate executable

The tmpfiles.d spec has proven useful in systemd, enough so that some developers
are starting to ship tmpfiles.d configuration files with their software.
By splitting the tmpfiles functionality in finit out into a separate executable
we are providing a useful piece of software that package managers can hook into.

plugins/bootmisc.c

@@ -38,7 +38,6 @@
 #include "finit.h"
 #include "helpers.h"
 #include "plugin.h"
-#include "tmpfiles.h"
 #include "util.h"
 #include "utmp-api.h"
 
@@ -163,7 +162,7 @@ static void setup(void *arg)
 	kernel_links();
 
 	/* Create all system tmpfiles.d(5) */
-	tmpfilesd();
+	run_interactive(_PATH_TMPFILES, "Creating required directories and files");
 
 	/* Set BOOT_TIME UTMP entry */
 	utmp_set_boot();