* master:
  slapos/recipe/redis: Add support for UNIX sockets
  slapos/recipe/redis/promise: Don't create connection pool explicitly
  redis: v↑  (2.8.23)
  ruby: v↑ ruby2.1  (2.1.7)
  component/postgresql: v↑ postgresql92  (9.2.14)
  component/postgresql: Factor out common build stuff to postgresql-common
  software/postgresql: Don't build postgresql twice
  version up: HAProxy 1.5.15