Add "podman volume" command

Add support for podman volume and its subcommands.
The commands supported are:
	podman volume create
	podman volume inspect
	podman volume ls
	podman volume rm
	podman volume prune

This is a tool to manage volumes used by podman. For now it only handle
named volumes, but eventually it will handle all volumes used by podman.

Signed-off-by: umohnani8 <umohnani@redhat.com>

1 files changed, 49 insertions, 0 deletions

diff --git a/docs/podman-volume-ls.1.md b/docs/podman-volume-ls.1.md
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+% podman-volume-ls(1)
+
+## NAME
+podman\-volume\-ls - List volumes
+
+## SYNOPSIS
+**podman volume ls** [*options*]
+
+## DESCRIPTION
+
+Lists all the volumes that exist. The output can be filtered using the **--filter**
+flag and can be formatted to either JSON or a Go template using the **--format**
+flag. Use the **--quiet** flag to print only the volume names.
+
+## OPTIONS
+
+**--filter**=""
+
+Filter volume output.
+
+**--format**=""
+
+Format volume output using Go template.
+
+**--help**
+
+Print usage statement.
+
+**-q**, **--quiet**=[]
+
+Print volume output in quiet mode. Only print the volume names.
+
+## EXAMPLES
+
+```
+$ podman volume ls
+
+$ podman volume ls --format json
+
+$ podman volume ls --format "{{.Driver}} {{.Scope}}"
+
+$ podman volume ls --filter name=foo,label=blue
+```
+
+## SEE ALSO
+podman-volume(1)
+
+## HISTORY
+November 2018, Originally compiled by Urvashi Mohnani <umohnani@redhat.com>