[DRE-maint] ruby-redis-namespace is marked for autoremoval from testing

[Debian testing autoremoval watch]

ruby-redis-namespace 1.4.1-2 is marked for autoremoval from testing on 2015-09-15

It is affected by these RC bugs:
794359: ruby-redis-namespace: FTBFS: port tests to rspec 3 for updating to 1.5.2