cli: Enable output in XML

This patch enables gluster cli to output data in xml format. XML output can be
obtained by passing "--xml" as an argument.

A new "volume list" command, which lists the volumes present in a cluster, has
been added. This can be used for obtaining a quick list of volumes.

Several commands, including "volume top", "volume profile", "volume status" and
"volume info", "volume list", have custom XML output routines. Other commands
use either one of the 2 generic output routines, cli_xml_output_str() &
cli_xml_output_dict().
NOTE: When using "all" for "volume status" and "volume info" the XML output will
have multiple roots.

Change-Id: I6117baa02ec06fda116177dbd401f66521263ac6
BUG: 790713
Signed-off-by: Kaushal M <kaushal@redhat.com>
Reviewed-on: http://review.gluster.com/2753
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-

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