Clean up foodcritic complaints.

FC002: Avoid string interpolation where not required: osl-cookbooks/osl-slapd/recipes/client.rb:5
FC043: Prefer new notification syntax: osl-cookbooks/osl-slapd/recipes/server.rb:82
FC043: Prefer new notification syntax: osl-cookbooks/osl-slapd/recipes/server.rb:91
code cleanup:

FC005: Avoid repetition of resource declarations: osl-cookbooks/goblin/recipes/worker.rb:15