machinectl: accept "none" and "infinity" as specifier when dropping quotas using "machinectl set-limit"

Previously, we already accepted "-" as special value for dropping
limits. Add "infinity", as that's what we support for RLIMITs and hence
should support here to. Also add "none" as that's what the btrfs tools
use.

src/machine/machinectl.c

@@ -2382,7 +2382,7 @@ static int set_limit(int argc, char *argv[], void *userdata) {
         uint64_t limit;
         int r;
 
-        if (streq(argv[argc-1], "-"))
+        if (STR_IN_SET(argv[argc-1], "-", "none", "infinity"))
                 limit = (uint64_t) -1;
         else {
                 r = parse_size(argv[argc-1], 1024, &limit);