Added setup_myemergeopts to setup_myfeatures and removed redundant calls to setup_mye...

Added setup_myemergeopts to setup_myfeatures and removed redundant calls to setup_myemergeopts.  Added some extra checks for clst_FETCH to disable certain functions/code paths when running with -F/--fetchonly.  Simplified kmerge.sh with regards to kerncache and callback packages.  Also, changed ccache/distcc installs to use run_emerge instead of emerge directly, which allows us to more easily replace the underlying package manager, or add support for multiple package managers to catalyst.

git-svn-id: svn+ssh://svn.gentoo.org/var/svnroot/catalyst/trunk@1225 d1e1f19c-881f-0410-ab34-b69fee027534