build-steps/1100_prepare-build-machine and development/Whonix-Shared_packages: added haveged to build depends
mount local OpenPGP APT repository signing key while installing from local APT repository to /etc/apt/trusted.gpg.d/
moved 'umount "$WHONIX_INITIAL_DEB_INSTALL_FOLDER"' to unchroot-img
sanity test if "$WHONIX_LOCAL_SIGNING_KEY_FOLDER"/done exists