if you are using gnupg2 with pinentry-curses for password input, when using librerelease without a cached password, terminal output breaks because of the usage of `read` in the find packages | while read { sign }.

usually i solve this by using `for package in $(find packages)`, that doesn't capture user input, but i tried this and it also breaks the output (!).

librerelease should also fail if the sign_packages function doesn't exit succesfully, since it leads to uploading unsigned packages, failed db-update server-side and having to librestage all over again. i'm pushing a fix for this.