Remove the headers from the Contents files (Closes: #841997)

Primarily machine-readable files are no place for documentation.

config/debian/Contents.top

-This file maps each file available in the Debian GNU/Linux system to
-the package from which it originates.  It includes packages from the
-DIST distribution for the ARCH architecture.
-
-You can use this list to determine which package contains a specific
-file, or whether or not a specific file is available.  The list is
-updated weekly, each architecture on a different day.
-
-When a file is contained in more than one package, all packages are
-listed.  When a directory is contained in more than one package, only
-the first is listed.
-
-The best way to search quickly for a file is with the Unix `grep'
-utility, as in `grep <regular expression> CONTENTS':
-
- $ grep nose Contents
- etc/nosendfile                                          net/sendfile
- usr/X11R6/bin/noseguy                                   x11/xscreensaver
- usr/X11R6/man/man1/noseguy.1x.gz                        x11/xscreensaver
- usr/doc/examples/ucbmpeg/mpeg_encode/nosearch.param     graphics/ucbmpeg
- usr/lib/cfengine/bin/noseyparker                        admin/cfengine
-
-This list contains files in all packages, even though not all of the
-packages are installed on an actual system at once.  If you want to
-find out which packages on an installed Debian system provide a
-particular file, you can use `dpkg --search <filename>':
-
- $ dpkg --search /usr/bin/dselect
- dpkg: /usr/bin/dselect
-
-
-FILE                                                    LOCATION

config/debian/dak.conf

@@ -259,7 +259,6 @@ Urgency
 
 Contents
 {
-  Header "contents";
   Root "/srv/ftp-master.debian.org/test/";
 }
 

daklib/contents.py

@@ -130,21 +130,12 @@ select bc.file, string_agg(o.section || '/' || b.package, ',' order by b.package
         }
         return BinaryContentsFileWriter(**values)
 
-    def get_header(self):
-        '''
-        Returns the header for the Contents files as a string.
-        '''
-        filename = os.path.join(Config()['Dir::Templates'], 'contents')
-        with open(filename) as header_file:
-            return header_file.read()
-
     def write_file(self):
         '''
         Write the output file.
         '''
         writer = self.writer()
         file = writer.open()
-        file.write(self.get_header())
         for item in self.fetch():
             file.write(item)
         writer.close()

templates/contents

-This file maps each file available in the Debian GNU/Linux system to
-the package from which it originates.  It includes packages from the
-DIST distribution for the ARCH architecture.
-
-You can use this list to determine which package contains a specific
-file, or whether or not a specific file is available.
-
-When a file is contained in more than one package, all packages are
-listed.
-
-
-FILE                                                    LOCATION