Deprecate underscored options

Do not use dry_run, extract_to and extract_from but rather dry-run,
extract-to and extract-from.

caso/extract/manager.py

@@ -54,13 +54,15 @@
 ]
 
 cli_opts = [
-    cfg.StrOpt('extract_to',
+    cfg.StrOpt('extract-to',
+               deprecated_name='extract_to',
                help='Extract record changes until this date. '
                     'If it is not set, we use now. If a server has '
                     'ended after this date, it will be included, but '
                     'the consuption reported will end on this date. '
                     'If no time zone is specified, UTC will be used.'),
-    cfg.StrOpt('extract_from',
+    cfg.StrOpt('extract-from',
+               deprecated_name='extract_from',
                help='Extract records that have changed after this date. This '
                     'means that if a record has started before this date, and '
                     'it has changed after this date (i.e. it is still running '

caso/manager.py

@@ -38,7 +38,8 @@
 ]
 
 cli_opts = [
-    cfg.BoolOpt('dry_run',
+    cfg.BoolOpt('dry-run',
+                deprecated_name='dry_run',
                 default=False,
                 help='Extract records but do not push records to SSM. This '
                 'will not update the last run date.'),

doc/source/usage.rst

@@ -24,7 +24,7 @@ command line
 your OpenStack deployment.
 ``caso-extract -h`` will show a complete list of available arguments.
 
-Use the ``--extract_from`` argument to specify the date from when the records
+Use the ``--extract-from`` argument to specify the date from when the records
 should be extracted. If no value is set, then ``cASO`` will extract the records
 from the last run. If equal to "None", then extract records from the beggining
 of time.  If not time zone is specified, UTC will be used.