Extend external test suite canonifier with set-sorting logic

Two new canonifiers: one to sort the contents of conn.log "service"
field and another to sort the contents of any field of type "set".

testing/scripts/diff-sort-set-elements

@@ -0,0 +1,60 @@
+#! /usr/bin/env bash
+#
+# A diff canonifier that sorts elements within fields of type set[T] for any T.
+
+awk '
+BEGIN { FS="\t"; OFS="\t"; }
+
+function bubble_sort(arr, len,    keep_going, i, tmp)
+    {
+    keep_going = 1;
+
+    while ( keep_going == 1 )
+        {
+        keep_going = 0;
+
+        for ( i = 1; i <= len - 1; ++i )
+            {
+            if ( arr[i] > arr[i + 1] )
+                {
+                tmp = arr[i];
+                arr[i] = arr[i + 1];
+                arr[i + 1] = tmp;
+                keep_going = 1;
+                }
+            }
+        }
+
+    return len;
+    }
+
+/^#types/ {
+    for ( i = 2; i <= NF; ++i )
+        {
+        if ( index($i, "set[") == 1 )
+            rem[i-1] = 1;
+        }
+}
+
+/^[^#]/ {
+    for ( i in rem )
+        {
+        if ( $i == "-" )
+            # The set has no value, skip sorting it.
+            continue;
+
+        n = split($i, set_contents, ",");
+        n = bubble_sort(set_contents, n);
+        sorted_field = set_contents[1];
+
+        for ( e = 2; e <= n; ++e )
+            sorted_field = sorted_field "," set_contents[e];
+
+        $i = sorted_field;
+        }
+}
+
+{
+    print;
+}
+'