Add optional parameter build-strategies to multibranch scm sections
(github, bitbucket, gerrit, git) in order to configure Basic Branch
Build Strategies Plugin
(https://github.com/jenkinsci/basic-branch-build-strategies-plugin).
This plugin allows control over whether to build a branch (or change
requests and tags). This also enables triggering builds on new tags
(normally the Multibranch Pipeline does not poll tags).
Change-Id: I908fe7c0ec81eb8503669177c337135fc4081a62
Task: 22732
Story: 2002816
2a654987eb