from: fix isolation option
from: fix isolation option

Add the isolation option to the from command.

Signed-off-by: Zhou Hao <zhouhao@cn.fujitsu.com>

Closes: #1044
Approved by: rhatdan

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