Add &ordered attribute for tables/sets

testing/btest/language/table-iteration.zeek

@@ -0,0 +1,27 @@
+# @TEST-EXEC: zeek -b %INPUT >out
+# @TEST-EXEC: btest-diff out
+# @TEST-EXEC: btest-diff .stderr
+
+global tbl: table[count] of count;
+global tbl2: table[count] of count &ordered;
+
+event zeek_init()
+{
+    local i = 0;
+    while ( i < 3 )
+    {
+       ++i;
+       tbl[i] = i;
+       tbl2[i] = i;
+    }
+
+    for ( [k], v in tbl )
+    {
+       print(v);
+    }
+
+    for ( [k], v in tbl2 )
+    {
+       print(v);
+    }
+}