Move packages and mock packages to /var/spack

bin/spack

lib/spack/spack/globals.py

lib/spack/spack/packages.py

lib/spack/spack/test/mock_packages_test.py

lib/spack/spack/test/packages.py

var/spack/mock_packages/callpath/package.py

var/spack/mock_packages/direct_mpich/package.py

var/spack/mock_packages/dyninst/package.py

var/spack/mock_packages/fake/package.py

var/spack/mock_packages/indirect_mpich/package.py

var/spack/mock_packages/libdwarf/package.py

var/spack/mock_packages/libelf/package.py

var/spack/mock_packages/mpich/package.py

var/spack/mock_packages/mpich2/package.py

var/spack/mock_packages/mpileaks/package.py

var/spack/mock_packages/multimethod/package.py

...ack/mock_packages/trivial_install_test_package/package.py

var/spack/mock_packages/zmpi/package.py

var/spack/packages/callpath/package.py

var/spack/packages/cmake/package.py