[8u66] RFR 8079410: Hotspot version to share the same update and build version from JDK

[Alejandro E Murillo]

Please review the following change that allows setting
the Hotspot minor version and build number to that
of the "--with-update-version" and "--with-build-number"
configure parameters when provided. 8u  builds only.

webrev:
http://javaweb.us.oracle.com/~amurillo/webrevs/8079410/

Background (since bug was originally filed as internal):

Currently, for 8u builds and earlier, the hotspot version looks like this
(remnant from the hotspot express days):

Java HotSpot(TM) Client VM (build 25.66-b00, mixed mode, sharing)


By convention, minor version (66 above) always matches the JDK update 
version
and hotspot build number is managed independently of the JDK build number.
Both values  are defined by default  in "hotspot/make/hotspot_version".
With this change they can now be setup using the corresponding JDK
configure parameters.

Consequences:

(1)  For promoted and other milestone builds, the hotspot minor version
will corresponds to the JDK update version and the hotspot build number
will match  the JDK build number.

(2) Hotspot snapshots will no longer need to change the hotspot build 
number
as that will be set at promotion time (matching the JDK build number).
Since this is stored in the file mentioned above, a  repo push
(and the corresponding bug) was required to  change it.
That will no longer be necessary.

(3)  Since JPRT configures both the update and build numbers,
  when building via JPRT, the hotspot build number for those builds
will always be  'b00' (matching the JDK build number). The Hotspot
minor version will match the update version defined in 
make/jprt.prtoperties:

java version "1.8.0_66-internal"
#   Java(TM) SE Runtime Environment (build 1.8.0_66-internal-20150720195933.amurillo.8079410-control-b00)
#   Java HotSpot(TM) Client VM (build 25.66-b00, mixed mode, sharing)

(4) Since the version string is not actually changing, I do not expect 
this to have
any impact on external tools or apps, but let me know if so.

Thanks

-- 
Alejandro