job-ingest: allow guests to access module stats

Problem: flux module stats is generally open to guests,
but the RPC override in the job-ingest module is not.

Open job-ingest.stats-get to guests.
Add a test to t2100-job-ingest.t.

Author: garlick

src/modules/job-ingest/job-ingest.c

@@ -739,7 +739,8 @@ static const struct flux_msg_handler_spec htab[] = {
     { FLUX_MSGTYPE_REQUEST,  "job-ingest.submit", submit_cb, FLUX_ROLE_USER },
     { FLUX_MSGTYPE_REQUEST,  "job-ingest.shutdown", shutdown_cb, 0 },
     { FLUX_MSGTYPE_REQUEST,  "job-ingest.config-reload", reload_cb, 0 },
-    { FLUX_MSGTYPE_REQUEST,  "job-ingest.stats-get",  stats_get_cb, 0 },
+    { FLUX_MSGTYPE_REQUEST,  "job-ingest.stats-get",
+      stats_get_cb, FLUX_ROLE_USER },
     FLUX_MSGHANDLER_TABLE_END,
 };
 

t/t2100-job-ingest.t

@@ -164,6 +164,11 @@ test_expect_success 'job-ingest: handle total batch failure in job-ingest' '
 	test_must_fail flux submit --cc=1-4 hostname
 '
 
+test_expect_success 'flux module stats job-ingest is open to guests' '
+	FLUX_HANDLE_ROLEMASK=0x2 \
+	    flux module stats job-ingest >/dev/null
+'
+
 test_expect_success 'job-ingest: remove modules' '
 	flux module remove job-manager &&
 	flux exec -r all flux module remove job-ingest