supervise-daemon: remove undocumented and unused -H option

this was added as a part of c1e5825, presumably as a
convenient way to specify a minutes timer. but it was never
documented, there's no init.d script variable for this and
finally, the number was never multiplied by 60, so it was
incorrect anyways.

given all that, just remove it. should be safe to do so.

if there's any actual demand for such convenience option, we can
change --healthcheck-timer to accept a duration similar to
--respawn-delay.

Author: N-R-K

src/supervise-daemon/supervise-daemon.c

@@ -89,7 +89,7 @@ enum {
 
 const char *applet = NULL;
 const char *extraopts = NULL;
-const char getoptstring[] = "A:a:D:d:e:g:H:I:Kk:m:N:p:R:r:s:Su:0:1:2:3" \
+const char getoptstring[] = "A:a:D:d:e:g:I:Kk:m:N:p:R:r:s:Su:0:1:2:3" \
 	getoptstring_COMMON;
 const struct option longopts[] = {
 	{ "healthcheck-timer",        1, NULL, 'a'},
@@ -986,11 +986,6 @@ int main(int argc, char **argv)
 			gid = gr->gr_gid;
 			break;
 
-		case 'H':  /* --healthcheck-timer <minutes> */
-			if (sscanf(optarg, "%d", &healthchecktimer) != 1 || healthchecktimer < 1)
-				eerrorx("%s: invalid health check timer %s", applet, optarg);
-			break;
-
 		case 'k':
 			if (parse_mode(&numask, optarg))
 				eerrorx("%s: invalid mode `%s'",