CDH3 SRPM does not include forrest install

This is another Koji/mock-compatibility issue.

We currently require FORREST_HOME to be setup outside the RPM build. This doesn't work in mock environments, which sets up a clean chroot environment. To fix this, I have added the apache forrest tarball as a new source (Source4 in my build):

Source4: apache-forrest-0.8.tar.gz

Then, the setup line changes to this:

%setup n hadoop%

-a 4

(where '4' is the source number). Next, set FORREST_HOME as the first line of build:

export FORREST_HOME=$PWD/apache-forrest-0.8

Finally, the attached patch will remove the Java5 dependency for Forrest.