python: do not assume JobList ids are type JobID

Problem: The JobList class allows the user to optionally set
jobids to lookup.  It assumes the jobids passed in are always
of type JobID, but that is not always a valid assumption.

When initializing the JobList object, map all input ids to
JobID before internally storing them.

Author: chu11

src/bindings/python/flux/job/list.py

@@ -13,6 +13,7 @@
 
 import flux.constants
 from flux.future import WaitAllFuture
+from flux.job import JobID
 from flux.job.info import JobInfo
 from flux.rpc import RPC
 
@@ -211,7 +212,7 @@ def __init__(
         self.since = since
         self.name = name
         self.queue = queue
-        self.ids = ids
+        self.ids = list(map(JobID, ids)) if ids else None
         self.errors = []
         for fname in filters:
             for x in fname.split(","):