hg: jdk9/sandbox: 8031567: Better model for storing source revision information

[chris.hegarty at oracle.com]

Changeset: 61d55f2ba01e
Author:    ihse
Date:      2016-11-28 09:20 +0100
URL:       http://hg.openjdk.java.net/jdk9/sandbox/rev/61d55f2ba01e

8031567: Better model for storing source revision information
Reviewed-by: erikj

! .hgignore
- make/CreateHgtipFiles.gmk
! make/Images.gmk
! make/Main.gmk
+ make/SourceRevision.gmk
! make/common/MakeBase.gmk