Reassert condition when svc_t goes from WAITING --> RUNNING

Reassert condition when an unchanged/unmodified process goes from
WAITING state to RUNNING.  I.e. it had a condition that went to flux
during `initctl reload`, which drove it to WAITING and was then sent
SIGSTOP during reconf.

Also, on condition update, loop through all services until no more state
changes are observed.  This allows long dependency chains of services to
resolve and actually go back to RUNNING state as intended whenever any
condition changes at runtime.

Signed-off-by: Jonas Johansson <jonasj76@gmail.com>
Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

plugins/pidfile.c

@@ -37,12 +37,6 @@ struct context {
 	int wd;
 };
 
-static char *mkcond(char *buf, size_t len, char *nm)
-{
-	snprintf(buf, len, "svc%s%s", nm[0] != '/' ? "/" : "", nm);
-	return buf;
-}
-
 static void pidfile_callback(void *arg, int fd, int events)
 {
 	static char ev_buf[8 *(sizeof(struct inotify_event) + NAME_MAX + 1) + 1];