apache-frontend: use master branch for slapos cookbook
apache-frontend: support RootSoftwareInstance type
Revert "apache-frontend: support RootSoftwareInstance type"

This reverts commit 8a6c47bc79dc4bb281e253ee6ca90705a09e0014.
apache-frontend: implement hack to render template with two software types
apache-frontend: update slave publication section to current publish recipe
Release slapos.cookbook-0.82.
apache-frontend: update versions and md5sum