Island: Move SizeError to its own file

monkey/monkey_island/cc/server_utils/encryption/__init__.py

@@ -15,3 +15,4 @@ from .data_store_encryptor import (
     reset_datastore_encryptor,
 )
 from .encryption_key_types import EncryptionKey32Bytes
+from .errors import SizeError

monkey/monkey_island/cc/server_utils/encryption/encryption_key_types.py

@@ -1,9 +1,4 @@
-class SizeError(Exception):
-    """
-    Raised when an argument is not of the expected size during object creation.
-    """
-
-    pass
+from . import SizeError
 
 
 class EncryptionKey32Bytes(bytes):

monkey/monkey_island/cc/server_utils/encryption/errors.py

@@ -0,0 +1,6 @@
+class SizeError(Exception):
+    """
+    Raised when an argument is not of the expected size during object creation.
+    """
+
+    pass