Remove unused password generation method from TestPredeployed class

predeployed/test/tools/test_predeployed.py

@@ -21,20 +21,6 @@ def __exit__(self, exc_type, exc_val, exc_tb):
 class TestPredeployed:
     GENESIS_FILENAME = 'genesis.json'
 
-    def generate_extradata(self):
-        self.password = ''.join(random.choices(string.ascii_lowercase + string.digits, k=12))
-        self.password_filename = os.path.join(self.datadir, 'password.txt')
-        with open(self.password_filename, 'w') as password_f:
-            password_f.writelines([self.password])
-        process = subprocess.run(['geth', 'account', 'new', '--datadir', self.datadir, '--password', self.password_filename])
-        assert process.returncode == 0
-
-        process = subprocess.Popen(['geth', 'account', 'list', '--datadir', self.datadir], stdout=subprocess.PIPE,
-                                   universal_newlines=True)
-        account0 = process.stdout.readline()
-        self.author_address = account0.split()[2][1:-1]
-        return '0x' + '00' * 32 + self.author_address + '00' * 65
-
     def generate_genesis(self, allocations: dict = {}):
         base_genesis_filename = os.path.join(os.path.dirname(__file__), 'base_genesis.json')
         with open(base_genesis_filename) as base_genesis_file: