Otherwise some dependend libraries might be missing in the ramdisk. E.g.
on SUSE bash is dynamically linked against libreadline.
Change-Id: I8b36bee6aa5a1e1da419e748e8bba046c29f3ae2
Ramdisks are now built inside a chroot which is built by the normal
image build process. Doing so improves our independence of the
precise state of the build host.
This fixes bug 1194055.
Change-Id: Ibc254fbb9e7b404b5f38c1b35bcde8a4136e8e28