Add podman image mount

There are many use cases where you want to just mount an image
without creating a container on it. For example you might want
to just examine the content in an image after you pull it for
security analysys.  Or you might want to just use the executables
on the image without running it in a container.

The image is mounted readonly since we do not want people changing
images.

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

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diff --git a/docs/source/markdown/podman-image-unmount.1.md b/docs/source/markdown/podman-image-unmount.1.md
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+% podman-image-unmount(1)
+
+## NAME
+podman\-image\-unmount - Unmount an image's root filesystem
+
+## SYNOPSIS
+**podman image unmount** [*options*] *image* [...]
+
+**podman image umount** [*options*] *image* [...]
+
+## DESCRIPTION
+Unmounts the specified images' root file system, if no other processes
+are using it.
+
+Image storage increments a mount counter each time a image is mounted.
+When a image is unmounted, the mount counter is decremented, and the
+image's root filesystem is physically unmounted only when the mount
+counter reaches zero indicating no other processes are using the mount.
+An unmount can be forced with the --force flag.
+
+## OPTIONS
+**--all**, **-a**
+
+All of the currently mounted images will be unmounted.
+
+**--force**, **-f**
+
+Force the unmounting of specified images' root file system, even if other
+processes have mounted it.
+
+Note: This could cause other processes that are using the file system to fail,
+as the mount point could be removed without their knowledge.
+
+## EXAMPLE
+
+podman image unmount imageID
+
+podman image unmount imageID1 imageID2 imageID3
+
+podman image unmount --all
+
+## SEE ALSO
+podman(1), podman-image-mount(1), podman-container-mount(1)