buildcore.sh script, the CWD is not the git repo. Use full path
Add the Release.save* file into the .gitignore in order to not track
this temporary file during the build
The build will also checkout the changelog files at the completion of
the build so that we are able to switch releases for Ubuntu.
This is caused by the build running in xcat-core instead of creating a
build directory for each release, like Linux is doing.
from the builds. Also remove the changelog because that file is going
to be ignored from the source tree. Ubuntu builds are being done
in the xcat-core directory and causing issues when we are switching
between releases. Should probably change the builds scripts as a longer
term solution
