[0.4.7][RAPPS/ATL] Fast-forward both to state of
0.4.8-release-0-gd47d448
Due to infrastructure changes on 2018-02-17 (after initial 0.4.7rls)
we totally broke the rapps compatibility of all releases before 0.4.8
leaving rapps useless in those.
Therefore I decided to port back what is necessary to make rapps work
again also in this ancient release.
fixes CORE-14351 adapts to infrastructure changes
fixes CORE-14350 RAPPS Certificate pinning
fixes download from FTP
and merges many other improvements from GSOC 2017 back in time