Remove some TODOs that have been around for way too long and havent been an issue for a long time

lib/vagrant-cachier/cap/arch/pacman_cache_dir.rb

@@ -4,7 +4,6 @@ module VagrantPlugins
       module Arch
         module PacmanCacheDir
           def self.pacman_cache_dir(machine)
-            # TODO: Find out if there is a config file we can read from
             '/var/cache/pacman/pkg'
           end
         end

lib/vagrant-cachier/cap/debian/apt_cache_dir.rb

@@ -4,7 +4,6 @@ module VagrantPlugins
       module Debian
         module AptCacheDir
           def self.apt_cache_dir(machine)
-            # TODO: Find out if there is a config file we can read from
             '/var/cache/apt/archives'
           end
         end

lib/vagrant-cachier/cap/linux/chef_file_cache_path.rb

@@ -19,7 +19,6 @@ module VagrantPlugins
 
           def self.chef_file_cache_path(machine)
             chef_file_cache_path = nil
-            # TODO: Determine paths rather than using default.
             chef_file_cache_path = '/var/chef/cache' if chef_provisioner?(machine)
 
             return chef_file_cache_path

lib/vagrant-cachier/cap/redhat/yum_cache_dir.rb

@@ -4,7 +4,6 @@ module VagrantPlugins
       module RedHat
         module YumCacheDir
           def self.yum_cache_dir(machine)
-            # TODO: Find out if there is a config file we can read from
             '/var/cache/yum'
           end
         end

lib/vagrant-cachier/cap/suse/zypper_cache_dir.rb

@@ -4,7 +4,6 @@ module VagrantPlugins
       module SuSE
         module ZypperCacheDir
           def self.zypper_cache_dir(machine)
-            # TODO: Find out if there is a config file we can read from
             '/var/cache/zypp/packages'
           end
         end