Remove spec for Gentoo specific logic that no longer exists

This test should have been removed as part of:

https://github.com/opscode-cookbooks/runit/commit/2721060f61eb32eb8b8fd2ca7f96b14010b2bdb3
[COOK-3243] expose LSB init directory as a configurable
Merge pull request #39 from opscode-cookbooks/COOK-3243

COOK-3243 - Expose LSB init directory as a configurable