[8u-dev] RFR for partial backport of 8031567: Better model for storing source revision information

[Simon Tooke]

Hi,

In the process of the latest CPU, I found the 'release' file differed
between the Linux and Windows built images, and tracked it down to the
use of 'hg tip' instead of 'hg id'.

As luck would have it, this was previously reported (JDK-8031567) and
fixed in JDK 9. 

Rather than backport the entire PR to jdk8u, I propose only enough to
fix the actual problem; replacing the calls to 'hg tip' with calls to
'hg id -i'.

Original JBS: https://bugs.openjdk.java.net/browse/JDK-8031567

Webrev: http://cr.openjdk.java.net/~stooke/webrevs/jdk-8031567/

I'm open to a full backport, but wanted to minimize perturbation of 8u. 
If this is misguided, please correct me...

Thank you for your time,

-Simon