Remove check for CHEF_ONLINE

The CHEF_ONLINE constant was removed from crowbar sometime ago already.
See: https://github.com/crowbar/barclamp-crowbar/pull/921 for details.
fix Travis breakage

Travis started failing with:

  uninitialized constant RSpec::Matchers::BuiltIn::RaiseError::MatchAliases (NameError)

due to bundler installing rspec-expectations-2.99 which is a
pre-release:

  https://github.com/rubygems/rubygems/issues/853
Merge pull request #114 from aspiers/fix-travis

fix Travis breakage
Merge pull request #113 from rhafer/no_chef_online

Remove check for CHEF_ONLINE