functional_tests: show build_roles output

also refactor some code

Change-Id: Ib809cf9cb3df8e30e58a96a18f901e10bd2a4b63
hiera: adds sf_version.yaml generated by bootstrap

Also feature the version number within gateway topmenu title

Change-Id: I006d605df65d39ba922c1b446fff689b81846600
Merge changes I006d605d,Ib809cf9c

* changes:
  hiera: adds sf_version.yaml generated by bootstrap
  functional_tests: show build_roles output