Removed the copy/paste code, moved it into a reusable function that can
be called from the `local_setup` function as needed. Also simplified the
handling of the $HOME variable since @rico-chet provided a better way of
doing this.
* Extracting common utilities into utilities.bash
* Adding new tests for utilities
* Relocating the cache file to be under $BASH_IT
* Removing cache cleanup deferral code for now
* Wiping the cache in local_setup in tests.
buhl
Nils Winkler
Konstantin Gredeskoul