[COOK-3653] Change template attribute to kind_of String

Signed-off-by: Seth Vargo <sethvargo@gmail.com>

Author: Denis Barishev

.rubocop.yml

@@ -12,4 +12,3 @@ LineLength:
   Enabled: false
 MethodLength:
   Max: 30
-

resources/default.rb

@@ -26,7 +26,7 @@
 attribute :host,       :kind_of => String,          :default => 'ALL'
 attribute :runas,      :kind_of => String,          :default => 'ALL'
 attribute :nopasswd,   :equal_to => [true, false],  :default => false
-attribute :template,   :regex => /^[a-z_]+.erb$/,   :default => nil
+attribute :template,   :kind_of => String,          :default => nil
 attribute :variables,  :kind_of => Hash,            :default => nil
 
 # Set default for the supports attribute in initializer since it is