Bug 1327157

Summary:	Publican is missing a way to list available brands (possibly taking --brand_dir option into account)
Product:	[Community] Publican	Reporter:	Jan Pokorný [poki] <jpokorny>
Component:	publican	Assignee:	Nobody <nobody>
Status:	NEW ---	QA Contact:	Ruediger Landmann <rlandman>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	future	CC:	cbredesen, rlandman
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Description Jan Pokorný [poki] 2016-04-14 11:22:35 UTC

Provided I am 100% sure the location is stable, I can:

$ ls -ld /usr/share/publican/Common_Content/*/

I am afraid there is not such universal guarantee.
Hence it would be better to have Publican abstract particular
search path away (especially when considering --brand_dir option)
and offer a method for user to query such internal knowledge
(regardless of PWD/current project).

For instance: publican print-brands
(note that underscores are a little bit typing/CLI unfriendly).