New reviewers: 7160496 : Rename JDK8 JAXP source directory

[Joe Wang]

After removing the jaxp source drop bundle process, refer to 7150324, 
the source structure needs to be changed to be consistent with that of 
jdk7. I will rename jdk8/jaxp/src/share/classes to jdk8/jaxp/src before 
updating it to the current jaxp source (7160380).

webrev for the build files: 
http://cr.openjdk.java.net/~joehw/jdk8/7160496/build/webrev/

webrevs for the src:  (result of hg mv src/share/classes src)   
http://cr.openjdk.java.net/~joehw/jdk8/7160496/src/webrev/

Thanks,
Joe