Turn stdio back to blocking when command finishes
Turn stdio back to blocking when command finishes

Fixes: https://github.com/containers/buildah/issues/3152

Sometimes after running buildah run in a terminal, commands executed afterwards which try to read from stdin fail with EAGAIN. This is because it sets O_NONBLOCK on the FD:

[NO TESTS NEEDED] Since I don't know how to test this.

Signed-off-by: Daniel J Walsh <7800de746fd39599bc46177380ea6aede7e31e16@redhat.com>

nalind/buildah-1,rhatdan/buildah,nalind/buildah-1,TomSweeneyRedHat/buildah,nalind/buildah,rhatdan/buildah,projectatomic/buildah,rhatdan/buildah,nalind/buildah-1,projectatomic/buildah,TomSweeneyRedHat/buildah,TomSweeneyRedHat/buildah,nalind/buildah,projectatomic/buildah