Some CPack tests require running
commands after the inclusion of
CPack.cmake and this patch enables
such tests to declare run_after_include_cpack
function which is run after the
inclusion.
CPack tests can now define one or more
packaging types and that test will be
executed once per generator per packaging
type. This also enables us to set default
values per packaging type for each generator
which makes tests shorter.
Package names are irrelevant for most
CPack tests so tests now set default
package name that is created from test
name and used if it is not explicitly
provided in the test.
