Remove uses of keyid_hash_algorithms

PR theupdateframework#1014 removed uses of keyid_hash_algorithms in favour of using the calculated
keyid values from the metadata. A few instances of this removal were
unintentionally reintroduced in PR theupdateframework#1016, when changing to explicitly passing
a list of hash algorithms rather than changing securesystemslib settings
values.

This change removes uneccessary uses of keyid_hash_algorithms.

Signed-off-by: Joshua Lock <jlock@vmware.com>

tuf/client/updater.py

@@ -952,8 +952,7 @@ def _import_delegations(self, parent_role):
         # We specify the keyid to ensure that it's the correct keyid
         # for the key.
         try:
-          key, _ = securesystemslib.keys.format_metadata_to_key(keyinfo, keyid,
-              keyid_hash_algorithms=keyinfo['keyid_hash_algorithms'])
+          key, _ = securesystemslib.keys.format_metadata_to_key(keyinfo, keyid)
 
           tuf.keydb.add_key(key, repository_name=self.repository_name)
 

tuf/keydb.py

@@ -123,7 +123,7 @@ def create_keydb_from_root_metadata(root_metadata, repository_name='default'):
       # All other keyids returned are ignored.
 
       key_dict, _ = securesystemslib.keys.format_metadata_to_key(key_metadata,
-          keyid, keyid_hash_algorithms=key_metadata['keyid_hash_algorithms'])
+          keyid)
 
       # Make sure to update key_dict['keyid'] to use one of the other valid
       # keyids, otherwise add_key() will have no reference to it.

tuf/repository_lib.py

@@ -652,7 +652,7 @@ def _load_top_level_metadata(repository, top_level_filenames, repository_name):
 
       # Use the keyid found in the delegation
       key_object, _ = securesystemslib.keys.format_metadata_to_key(key_metadata,
-          keyid, keyid_hash_algorithms=key_metadata['keyid_hash_algorithms'])
+          keyid)
 
       # Add 'key_object' to the list of recognized keys.  Keys may be shared,
       # so do not raise an exception if 'key_object' has already been loaded.