hg: jdk9/sandbox: 2 new changesets

[magnus.ihse.bursie at oracle.com]

Changeset: 3788f279ad0f
Author:    ihse
Date:      2017-06-20 14:11 +0200
URL:       http://hg.openjdk.java.net/jdk9/sandbox/rev/3788f279ad0f

More about testing.

! common/doc/building.md

Changeset: 4fe04ae94c15
Author:    ihse
Date:      2017-06-20 14:13 +0200
URL:       http://hg.openjdk.java.net/jdk9/sandbox/rev/4fe04ae94c15

Merge

! common/doc/testing.html
! common/doc/testing.md