remove file ctime

Signed-off-by: Dominik Richter <dominik.richter@gmail.com>

lib/resources/file.rb

@@ -15,7 +15,7 @@ module Vulcano::Resources
       type exists? file? block_device? character_device? socket? directory?
         symlink? pipe?
       mode mode? owner owned_by? group grouped_into? link_target linked_to?
-        content mtime ctime size selinux_label
+        content mtime size selinux_label
         mounted? immutable? product_version file_version version?
         md5sum sha256sum
     }.each do |name|

lib/vulcano/backend/specinfra.rb

@@ -220,10 +220,6 @@ module Vulcano::Backends
         Specinfra::Runner.get_file_mtime(@path).stdout.strip
       end
 
-      def ctime
-        Specinfra::Runner.get_file_ctime(@path).stdout.strip
-      end
-
       def size
         Specinfra::Runner.get_file_size(@path).stdout.strip.to_i
       end

lib/vulcano/plugins/backend.rb

@@ -25,7 +25,7 @@ module Vulcano::Plugins
       # interface methods: these fields should be implemented by every
       # backend File
       %w{
-        exists? mode owner group link_target content mtime ctime size
+        exists? mode owner group link_target content mtime size
         selinux_label product_version file_version
       }