Need reviewer, 7150324: Stop using drop bundles in jaxp

[Kelly O'Hair]

7150324: Stop using drop bundles in jaxp
http://cr.openjdk.java.net/~ohair/openjdk8/infra-jaxp/webrev/

I'm working on helping to get the jdk8 build-infra changes integrated, this is for jaxp.

This is just the changes to the build files to remove the use of the drop bundles and add a new Makefile
that won't be used just yet. The ant scripts have been cleaned up and simplified too.

The webrevs do not contain the src/ directory addition, made it too big a webrev.

I created a make/scripts/update_src.sh script that will copy in the
latest source drop bundle that was used for this repository, position it in the src/ directory,
and run the whitespace normalizer script. This script could be re-used in the future but
it's mostly there to document how I pulled the sources into the repository.

Once these changes are reviewed, I would need to:
   sh ./make/scripts/update_src.sh&&  hg addremove src
on the repository before creating the changesets that bring in all these sources.

I have run builds and verified that the two deliveries from these repositories (dist/lib/classes.jar
and dist/lib/src.zip) match the ones created before this change.
The only exception is the whitespace normalization in some of the sources.

These changes should not impact the final built jdk bits.

-kto