Make "flavor show" command to show a private flavor properly

The "flavor show" command could not show a
private flavor by flavor name becauce it could
not find a private flavor by flavor name.
In "until.find_resource(parsed_args.flavor)",
If parsed_args.falvor is a name of a flavor,
"flavors.find(name=parsed_args.flavor)"will be
called to find a flavor.But the default value of
"is_public" is "Ture" in "flavors.find()" so that
we can only find public flavors.If we want to find
all flaovrs by flavor name,we should add
"is_public=None" in "flavors.find()".

So I tried to change
"until.find_resource(parsed_args.flavor)" to
"until.find_resource(parsed_args.flavor, is_public=None)",
but then I could not find any flavor by flavor id
because "is_public" is an unexpected argument of
"flavors.get()" in "until.find_resource()".

In this case,I think "until.find_resource()"
can not find a private flavor properly,and
we should combine "manager.get(flavor.id)" and
"manager.find(name=flavor.name, is_public=None)"
by ourselve to find a flavor.

Also,this bug affects other flavor commands like
"flavor set/unset/delete",so I fix them in this patch too.

Change-Id: I4a4ed7b0a2f522ee04d1c3270afcda7064285c39
Closes-Bug: #1575478

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