hg: jdk/sandbox: Import initial implementation by tgranat.

[magnus.ihse.bursie at oracle.com]

Changeset: 48d12f5a824c
Author:    ihse
Date:      2018-12-04 12:16 +0100
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/48d12f5a824c

Import initial implementation by tgranat.

+ test/make/autoconf/TEST.ROOT
+ test/make/autoconf/lookup-a-string.sh
+ test/make/autoconf/no-option.sh
+ test/make/autoconf/test-utils.sh
+ test/make/autoconf/unknown-option.sh