Incorrect usage of str_replace in the example of post-deployment configuration template

[Karthik S]

In the example provided in "Post-Deploy extra configuration" of [1], the usage of str_raplace is not according to its syntax.

Expected syntax
---------------
str_replace:
  template: <template string>
  params: <parameter mappings>

Actual usage
------------
str_replace:
  template: <template string>
  parameters: <parameter mappings>

[1] https://docs.openstack.org/developer/tripleo-docs/advanced_deployment/extra_config.html

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/465931

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/465931
Committed: https://git.openstack.org/cgit/openstack/tripleo-docs/commit/?id=e5d955cc2f032b3cc617a962d6fb2f4fc113346c
Submitter: Jenkins
Branch: master

commit e5d955cc2f032b3cc617a962d6fb2f4fc113346c
Author: Karthik S <email address hidden>
Date: Thu May 18 07:19:47 2017 -0400

    Corrected the usage of str_replace in the example

    Modified the example of post-deployment configuration template,
    where the 'parameters' is used instead of 'params' attribute of
    str_replace.

    Change-Id: Id646e316f18252a2add2c02d13ed6659d0983273
    Closes-Bug: 1691730
    Signed-off-by: Karthik S <email address hidden>