For all tests - use debug db, not the 'production db'

tests/conftest.py

@@ -0,0 +1,6 @@
+import nkms.db
+
+
+def pytest_runtest_setup(item):
+    # Monkey-patching for tests so that we don't overwrite the default db
+    nkms.db.DB_NAME = 'debug-rekeys-db'

tests/test_db.py

@@ -1,11 +1,7 @@
-import nkms.db
 from nkms.db import DB
 import shutil
 import pytest
 
-# Monkey-patching for tests so that we don't overwrite the default db
-nkms.db.DB_NAME = 'debug-rekeys-db'
-
 
 def test_db():
     db = DB()