Unbreak misc::statistics on <= precise systems

Commits f36ea9f3, 5c5cda10, c67c4aee added libyaml-cpp0.3,
libyaml-cpp0.3-dev & libgoogle-glog-dev to misc::statistics::packages.
However, this (incredibly generic) class is also being included in 12.04
systems, like stat1001 & helium, which do not include these packages.
Revert those commits as puppet has been broken for 12 days on those
systems despite this being a known problem.

Change-Id: Iba7fb2c08e1523b53857c1a7ce583d16a5802fb4
Merge "Unbreak misc::statistics on <= precise systems" into production