RFR 8030011: Update Hotspot version string output

[Alejandro E Murillo]

Please review this change to make the hotspot related output produced by 
"java -version"
match the corresponding JDK output:

webrev: http://cr.openjdk.java.net/~amurillo/9/8030011/
Bug: https://bugs.openjdk.java.net/browse/JDK-8030011

Note that we initially wanted to obtain more information from the repo 
being built and add
it to the hotspot version output, but that will require changes in the 
JPRT, so
we have decided to split the change in 2 bugs. One to make the version match
(above webrev) and another one, an RFE, to add additional information 
extracted from the repo.

Note that in the current version of vm_version.cpp, there is no error 
checking in product mode,
I was suggested to make that explicit.

Release Engineering did some testing and I also ran several cases with
full and just hotspot JPRT builds.

Here is a summary of how the new output compares to the old one:

(1)  Release Engineering builds (9-dev):

from jdk9-dev build:
java version "1.9.0-ea"
Java(TM) SE Runtime Environment (build 
1.9.0-ea-langtools-nightly-h257-20140328-b07-b00)
Java HotSpot(TM) 64-Bit Server VM (build 
1.9.0-ea-langtools-nightly-h257-20140328-b07-b00, mixed mode)

compared with what we currently have
java version "1.9.0-ea"
Java(TM) SE Runtime Environment (build 
1.9.0-ea-langtools-nightly-h247-20140326-b06-b00)
Java HotSpot(TM) 64-Bit Server VM (build 25.0-b62, mixed mode)

(2)  Release Engineering builds (jdk9):

java version "1.9.0-ea"
Java(TM) SE Runtime Environment (build 1.9.0-ea-b07)
Java HotSpot(TM) Server VM (build 1.9.0-ea-b07, mixed mode)

compared with what we currently have
java version "1.9.0-ea"
Java(TM) SE Runtime Environment (build 1.9.0-ea-b07)
Java HotSpot(TM) 64-Bit Server VM (build 25.0-b62, mixed mode)

(3) JPRT Full builds:

java version "1.9.0-internal"
#   Java(TM) SE Runtime Environment (build 1.9.0-internal-201404091627.amurillo.jdk9-hs-ver-str-co-b00)
#   Java HotSpot(TM) Server VM (build 1.9.0-internal-201404091627.amurillo.jdk9-hs-ver-str-co-b00, mixed mode)


(4) JPRT hotspot only builds:

java version "1.9.0-ea-fastdebug"
#   Java(TM) SE Runtime Environment (build 1.9.0-ea-fastdebug-b06)
#   Java HotSpot(TM) Server VM (build 1.9.0-internal-201404031820.amurillo.jdk9-hs-ver-str-HS-fastdebug, mixed mode)


in this one the built VM is inserted into a promoted build bundle,
since we do not have the JDK build number info in the hotspot repo,
we can't match the build number in the JDK portion.
With the RFE mentioned above, we can extract the build info from the repo
and add it to the hotspot portion.

I want to  mention, that this may change once the new JDK version change 
is implemented
but we don't know when that will be implemented yet, so we need to go 
ahead with this to
get rid of the old hotspot express output. And most of these changes 
will still have to be done
anyways

BTW,  john Coomes and Dan Daugherty provided feedback in some pieces of 
this webrev,
but I need full reviews now.

Thanks

-- 
Alejandro