buildah: add recipe for buildah v1.26

buildah is a command line tool, to be installed and run on target,
that can be used to:
   - create a working container, either from scratch or using an image
     as a starting point
   - create an image, either from a working container or via the
     instructions in a Dockerfile
   - images can be built in either the OCI image format or the
     traditional upstream docker image format
   - mount a working container's root filesystem for manipulation
   - unmount a working container's root filesystem
   - use the updated contents of a container's root filesystem as a
     filesystem layer to create a new image
   - delete a working container or an image
   - rename a local container

Testing:
Setup the build directory:
   $ . oe-init-build-env <build_dir>

Add to local.conf:
   IMAGE_INSTALL:append = " buildah kernel-modules"
   KERNEL_FEATURES += "features/overlayfs/overlayfs.cfgi \
                       features/netfilter/netfilter.scc  \
                       features/lxc/lxc-enable.scc"
   IMAGE_ROOTFS_EXTRA_SPACE = "5242880"

Build image:
   $ bitbake core-image-minimal

Run the image:
   $ runqemu nographic kvm qemuparams="-m 4096"

On target:
Pull an image:
   > cnt=$(buildah from fedora)

Or build from Dockerfile
   > buildah bud -t <image_name>:<tag> .

Mount the image:
   > mnt=$(buildah mount ${cnt})

Install packages on the container rootfs:
   > dnf install --installroot $mnt <packages_to_install> -y

Copy local files to the container:
   > buildah copy $cnt <local_file> <dest_on_container>

Save the changes to an image
   > buildah commit --format docker $cnt <name>:<tag>

Run the image using buildah:
   > buildah run $cnt /bin/sh

Or using docker:
   > docker run -it <name>:<tag>

Signed-off-by: Sakib Sajal <sakib.sajal@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

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