content-sqlite: allow guests to access module stats

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

Open content-sqlite.stats-get to guests.
Add a test to t0012-content-sqlite.t.

Author: garlick

src/modules/content-sqlite/content-sqlite.c

@@ -738,7 +738,8 @@ static const struct flux_msg_handler_spec htab[] = {
                             checkpoint_get_cb, 0 },
     { FLUX_MSGTYPE_REQUEST, "content-backing.checkpoint-put",
                             checkpoint_put_cb, 0 },
-    { FLUX_MSGTYPE_REQUEST, "content-sqlite.stats-get", stats_get_cb, 0 },
+    { FLUX_MSGTYPE_REQUEST, "content-sqlite.stats-get",
+                            stats_get_cb, FLUX_ROLE_USER },
     FLUX_MSGHANDLER_TABLE_END,
 };
 

t/t0012-content-sqlite.t

@@ -373,6 +373,11 @@ test_expect_success 'full instance start fails corrupt database' '
 	test_must_fail flux start -o,-Sstatedir=$(pwd) /bin/true
 '
 
+test_expect_success 'flux module stats content-sqlite is open to guests' '
+	FLUX_HANDLE_ROLEMASK=0x2 \
+	    flux module stats content-sqlite >/dev/null
+'
+
 test_expect_success 'remove content-sqlite module on rank 0' '
 	flux module remove content-sqlite
 '