COOK-4086, add omnios support

Signed-off-by: Sean OMeara <someara@opscode.com>

test/fixtures/cookbooks/fake/metadata.rb

@@ -0,0 +1,3 @@
+name "fake"
+version "0.0.1"
+description "Not a real cookbook, used for testing only."

test/fixtures/cookbooks/fake/recipes/omnios.rb

@@ -0,0 +1,5 @@
+execute "pkg set-publisher -g http://pkg.omniti.com/omniti-ms/ ms.omniti.com" do
+  not_if "pkg publisher ms.omniti.com"
+end
+
+execute "pkg refresh --full"