Cherry-pick commits from release-0.2 branch

    * Use https authentication URL if SSL is enabled.
    * murano-git-install configures more options.
    * murano-git-install generates sample certificate
    * murano-gi-install configures SSL for heat and keystone
    * git log doesn't use pager now.
    * RabbitMQ host takes LAB_HOST value but could be redefined.
    * Global variable replaced by local.
    * Variable name typo fix.
    * Upgrade pbr during prerequisites phase.

Change-Id: Ie0dd8d602251f104e2b9b9c589c53244b9daf720