discover: drop old code

Signed-off-by: Kyr Shatskyy <kyrylo.shatskyy@clyso.com>

Author: Kyr Shatskyy

downburst/discover.py

@@ -100,20 +100,6 @@ def get_latest_release_serial(self, release):
 
         raise NameError('Image not found on server at ' + url)
 
-    def get_serial(self, release):
-        url = self.URL + '/query/released.latest.txt'
-        r = requests.get(url)
-        r.raise_for_status()
-        serial = None
-        for row in csv.DictReader(r.content.decode().strip().split("\n"),
-                                  delimiter="\t",
-                                  fieldnames=('release', 'flavour', 'stability',
-                                              'serial')):
-
-            if row['release'] == release and row['flavour'] == 'server':
-                return row['serial'], row['stability']
-        raise NameError('Image not found on server at ' + url)
-
     def get_filename(self, arch, version, state):
         if state == 'release':
             state = ''