flux-resource: use a set type for args.queue

Problem: The `-q, --queue` option for all flux-resource(1) subcommands
takes a comma separated list of queues and args.queue is a string
which has to be split at the comma in place when used. This not only
duplicates work, but is error prone since the string itself is also
iterable and a forgotten args.queue.split() would cause the code to
treat each character as a queue.

Store args.queue as a set() using flux.util.FilterActionSetUpdate.
Update sites where args.queue.split(",") is no longer necessary.

Author: grondo

src/cmd/flux-resource.py

@@ -27,7 +27,7 @@
     resource_status,
 )
 from flux.rpc import RPC
-from flux.util import Deduplicator, UtilConfig
+from flux.util import Deduplicator, FilterActionSetUpdate, UtilConfig
 
 
 class FluxResourceConfig(UtilConfig):
@@ -198,7 +198,7 @@ def ranks_by_queue(resource_set, config, queues):
     """
     queue_resources = QueueResources(resource_set, config)
     ranks = IDset()
-    for queue in queues.split(","):
+    for queue in queues:
         ranks.add(queue_resources.queue(queue).ranks)
     return ranks
 
@@ -759,6 +759,8 @@ def main():
     drain_parser.add_argument(
         "-q",
         "--queue",
+        action=FilterActionSetUpdate,
+        default=set(),
         metavar="QUEUE,...",
         help="Include only specified queues in output",
     )
@@ -824,6 +826,8 @@ def main():
     status_parser.add_argument(
         "-q",
         "--queue",
+        action=FilterActionSetUpdate,
+        default=set(),
         metavar="QUEUE,...",
         help="Include only specified queues in output",
     )
@@ -879,6 +883,8 @@ def main():
     list_parser.add_argument(
         "-q",
         "--queue",
+        action=FilterActionSetUpdate,
+        default=set(),
         metavar="QUEUE,...",
         help="Include only specified queues in output",
     )
@@ -911,6 +917,8 @@ def main():
     info_parser.add_argument(
         "-q",
         "--queue",
+        action=FilterActionSetUpdate,
+        default=set(),
         metavar="QUEUE,...",
         help="Include only specified queues in output",
     )
@@ -959,6 +967,8 @@ def main():
     R_parser.add_argument(
         "-q",
         "--queue",
+        action=FilterActionSetUpdate,
+        default=set(),
         metavar="QUEUE,...",
         help="Include only specified queues in output",
     )