[BUG] Change logging config (#307)

* Change logging config.

* Some adjusts.

* Remove a code smell.

Author: moromimay

butterfree/__init__.py

@@ -1,8 +1 @@
 """Module docstring example, following Google's docstring style."""
-import logging.config
-import os
-import sys
-
-sys.path.insert(0, os.path.abspath("."))
-
-logging.config.fileConfig(fname="butterfree/logging.conf")

butterfree/logging.conf

@@ -16,13 +16,10 @@ def test_migrate_all_pairs(self, mocker):
 
 class TestMigrate:
     def test_migrate_success(self, mocker):
-        mocker.patch.object(migrate.Migrate, "run")
         all_fs = migrate.migrate("tests/mocks/entities/")
         assert all(isinstance(fs, FeatureSetPipeline) for fs in all_fs)
         assert sorted([fs.feature_set.name for fs in all_fs]) == ["first", "second"]
 
-    def test_migrate_run_methods(self, mocker):
-        mocker.patch.object(CassandraMigration, "apply_migration")
         mocker.patch.object(migrate.Migrate, "_send_logs_to_s3")
 
         all_fs = migrate.migrate("tests/mocks/entities/", False, False)