make, run_task: Add short option for --task-name

Instead of --task-name one can pass -n now.
ostree-build-archlinux: Remove

We don't need this anymore because building a Archlinux base system is
harder than using Yocto.
build: Fix /usr/share/ostree/triggers-run path

Fix typo.
guestfish: Fix typo

It's self.logger not self.log.