removed expect from mkimage-arch since it was not working

Docker-DCO-1.1-Signed-off-by: NikolaMandic <mn080202@gmail.com> (github: NikolaMandic)
Merge branch 'master' of https://github.com/NikolaMandic/docker into NikolaMandic-master

* 'master' of https://github.com/NikolaMandic/docker:
  removed expect from mkimage-arch since it was not working

Conflicts:
	contrib/mkimage-arch.sh

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
Merge pull request #6784 from tianon/NikolaMandic-master

Update contrib/mkimage-arch.sh to remove use of "expect" since the output of pacstrap has changed