hg: code-tools/jtreg: 2 new changesets

[jonathan.gibbons at oracle.com]

Changeset: 4e56945f1ff2
Author:    jjg
Date:      2018-03-02 16:02 -0800
URL:       http://hg.openjdk.java.net/code-tools/jtreg/rev/4e56945f1ff2

Update README; now same as content on website

! README

Changeset: 51bd85270bd9
Author:    jjg
Date:      2018-03-02 16:04 -0800
URL:       http://hg.openjdk.java.net/code-tools/jtreg/rev/51bd85270bd9

Minor updates to build-all.sh for configurability

! make/build-all.sh