The argument format hint of -Pf option is ambiguous

[Yingzhe Zeng]

The help output of -Pf option for stack-create/stack-preview/stack-update is as following:

#################################################################
-Pf <KEY=VALUE>, --parameter-file <KEY=VALUE>
                        Parameter values from file used to create the stack.
                        This can be specified multiple times. Parameter value
                        would be the content of the file
#################################################################

The format hint <KEY=VALUE> is kind of misleading, people may think VALUE is an actual value to be set to parameter KEY.
But actually VALUE should be a file path which contains the value to be set.

So perhaps changing this format hint to <KEY=FILE> would be better.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/216515

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/216515
Committed: https://git.openstack.org/cgit/openstack/python-heatclient/commit/?id=91e20bc0721c641e4cd8c2f18d29c2f286e47e6e
Submitter: Jenkins
Branch: master

commit 91e20bc0721c641e4cd8c2f18d29c2f286e47e6e
Author: zengyingzhe <email address hidden>
Date: Tue Aug 25 11:37:46 2015 +0800

    Improve the format hint of -Pf option

    Change the format hint of -Pf option for stack-create/stack-preview
    /stack-update commands, from <KEY=VALUE> to <KEY=FILE>.

    Closes-Bug: #1486855
    Change-Id: Ib6117325d1b582710bd6b9cddfdbc5e9971b3707