Adapt to changes in cryptsetup; use "cryptroot-unlock" program
* Makefile (install-client-nokey): Also install new script files "mandos-to-cryptroot-unlock" and "initramfs-tools-script-stop". * debian/mandos-client.dirs: Add "usr/share/initramfs-tools/scripts/local-premount". * initramfs-tools-hook: Also copy "mandos-to-cryptroot-unlock". * initramfs-tools-script: Only modify keyscript setting in cryptroot file if the file exists, otherwise start "mandos-to-cryptroot-unlock" in background. * initramfs-tools-script-stop: New script to make sure plugin-runner has stopped before continuing. * mandos-to-cryptroot-unlock: New script to run plugin-runner and feed any password it gets into the "cryptroot-unlock" program.