Add podman system prune and info commands

We are missing the equivalence of the docker system commands

This patch set adds `podman system prune`
and `podman system info`

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

1 files changed, 37 insertions, 0 deletions

diff --git a/docs/podman-system-prune.1.md b/docs/podman-system-prune.1.md
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+% podman-system-prune(1) podman
+
+## NAME
+podman\-system\-prune - Remove all unused container, image and volume data
+
+## SYNOPSIS
+**podman system prune**
+[**-all**|**--a**]
+[**-force**|**--f**]
+[**-help**|**--h**]
+[**-volumes**|**--v**]
+
+## DESCRIPTION
+**podman system prune** removes all unused containers, (both dangling and unreferenced) from local storage and optionally, volumes.
+
+With the `all` option, you can delete all unused images.  Unused images are dangling images as well as any image that does not have any containers based on it.
+
+By default, volumes are not removed to prevent important data from being deleted if there is currently no container using the volume. Use the --volumes flag when running the command to prune volumes as well.
+
+## OPTIONS
+**--all, -a**
+
+Remove all unused images not just dangling ones.
+
+**--force, -f**
+
+Do not prompt for confirmation
+
+**--volumes**
+
+Prune volumes not used by at least one container
+
+## SEE ALSO
+podman(1), podman-image-prune(1), podman-container-prune(1), podman-volume-prune(1)
+
+# HISTORY
+February 2019, Originally compiled by Dan Walsh (dwalsh at redhat dot com)