RFR (JAXP): 8167179: Make XSL generated namespace prefixes local to transformation process

[Aleks Efimov]

Hi,
Please help to review the JDK9 fix for JDK-8167179 [1]:
     http://cr.openjdk.java.net/~aefimov/8167179/9/00/:
The fix changes how the xsl:element namespace prefix values are 
generated during the transformation process.

JDK9 build that includes this fix was tested with JDK XML related tests 
and with JCK-runtime/devtools suites. No failures were observed among 
these tests.

With Best Regards,
Aleksej

[1] https://bugs.openjdk.java.net/browse/JDK-8167179