Make nailgun agent work with ruby 1.9
Make nailgun agent work with ruby 1.9

* String.inject does not exist any more (String is not Enumerable any
  more, and it doesn't get automatically splitted).
* Ohai::System.fetch is gone

blueprint support-ubuntu-trusty

Change-Id: I0271ac5a3c991b093ddce2050cd195d047c1be39
Signed-off-by: Sergii Golovatiuk <98168b9e97e341cddc0074e7bec42876c0bd6617@mirantis.com>

warpc/fuel-nailgun-agent