Must specify the version being used for the activesupport gem.
If the version is not specificed it tries the newest which we
can not support on Roxy due to the ruby version in use.

2.3.17 is what is available on the admin server.

Signed-off-by: JuanJose 'JJ' Galvez <jj.galvez@inktank.com>
Merge pull request #965 from jgalvez/feature/wip-roxy-bluepill-deploy-fix/master

Fix: Must specify the version being used for the activesupport gem.