[fuel-plugin] Unhardcode rpm release version

[Aleksey Zvyagintsev]

Release variable for rpm version should be UN-hardcoded

https://github.com/openstack/fuel-plugins/blob/master/fuel_plugin_builder/templates/v3/build/plugin_rpm.spec.mako#L19

cat metadata.yaml |grep version
version: '2.0.20160825143111'

rpm -qip detach-murano-2.0-2.0.20160825143111-1.noarch.rpm
Name : detach-murano-2.0
Version : 2.0.20160825143111
Release : 1

This change need to be able cover daily-build's of plugin
(same version - different revision)

[Evgeniy L (rustyrobot)]

Has to be fixed by providing an optional parameter "build_version" in metadata.yaml which by default should be "1". It further should be rendered in rpm spec in "Release" section.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/362016
Committed: https://git.openstack.org/cgit/openstack/fuel-plugins/commit/?id=dd03155047f88035ee88bdc21acdb8c04b08fd33
Submitter: Jenkins
Branch: master

commit dd03155047f88035ee88bdc21acdb8c04b08fd33
Author: alexz <email address hidden>
Date: Mon Aug 29 13:57:35 2016 +0300

    Allow posibility to provide rpm 'Release' version

     * This option allow to iterate pkg version, w\o
       updating plugin version

    Closes-Bug: #1616929

    Change-Id: I41cfb19da93d2d6e0c95fcb17ead1d08fbfcab99