Swap 'blacklist' for 'denylist' (#81)

Summary:
In the spirit of inclusivity and non-discrimination, this PR will swap-out the use of `blacklist` for the more acceptable word `denylist`.

This PR would close-out Issue #80 on this repo (and [an issue with our of our Chef cookbooks](uber/client-platform-engineering#40) which works atop `chefctl`).

Pull Request resolved: #81

Reviewed By: nikitakoshikov

Differential Revision: D22528913

Pulled By: davide125

fbshipit-source-id: 1976b5cb560e0834b359efb0f25344c04d53402b

chefctl/src/chefctl.rb

@@ -451,14 +451,14 @@ def shell_output(command)
 
       # Returns a list of processes whos commands match the given command.
       # `command` should be a Regexp or String.
-      # `blacklist` should be an Array of Regexp.
-      # If blacklist is provided, commands that match any of the entries are
+      # `exclude` should be an Array of Regexp.
+      # If exclude is provided, commands that match any of the entries are
       # not included in the output.
       # Returns an Array of Hashes with keys: `:pid`, `:command`, `:nsid`
-      def list_processes(command, blacklist = nil, parents = false,
+      def list_processes(command, exclude = nil, parents = false,
                          same_nsid = true)
         check_nsid = same_nsid
-        blacklist ||= []
+        exclude ||= []
         procs = []
 
         # `ps` on older platforms (notably centos6 and osx) don't have a pidns
@@ -496,8 +496,8 @@ def list_processes(command, blacklist = nil, parents = false,
           procs.select! { |p| command =~ p[:command] }
         end
 
-        # don't want stuff in the blacklist
-        blacklist.each do |b|
+        # don't want stuff to exclude
+        exclude.each do |b|
           procs.reject! { |p| b =~ p[:command] }
         end