make productfectcher use default threads capo property

apps/cli/executables/pexable/productfetcher/productfetcher/product_fetcher.py

@@ -24,6 +24,8 @@ from pathlib import Path
 from typing import List, Type
 
 # pylint: disable=E0401, E0402, R0913
+from pycapo import CapoConfig
+
 from .exceptions import FetchError
 from .fetcher_factory import ConfiguredFetcherFactory
 from .fetchers import ForceMode
@@ -263,6 +265,8 @@ class FetchContext:
         :return: an argparse 'parser' with command line options for productfetcher.
         """
 
+        default_threads = CapoConfig().settings("edu.nrao.workspaces.ProductFetcherSettings").defaultThreadsPerHost
+
         parser = argparse.ArgumentParser(
             description=_PROLOGUE,
             formatter_class=argparse.RawTextHelpFormatter,
@@ -272,9 +276,9 @@ class FetchContext:
             CLIParam.CONCURRENCY.value,
             action="store",
             dest="concurrency",
-            help="maxmimum threads per plan (set to 1 for no threading)",
+            help="maximum threads per plan (set to 1 for no threading)",
             type=int,
-            default=16,
+            default=default_threads,
         )
 
         parser.add_argument(