Fix ohai lsb system detection on SLE11

On SLE11 lsb-release which is used by rubygem-ohai is not installed by
default. This patch detectc is lsb is not working and install lsb-release
packages and reload ohai. Plase note specific invocation of the resources
which to run them during compilation time.

Bug reported here: https://bugzilla.novell.com/show_bug.cgi?id=809129
Merge pull request #5 from tpaszkowski/grizzly-fixohai-for-sle

Fix ohai lsb system detection on SLE11 (bnc#809129)