Define BuildDepResult object (based on IntEnum)

Signed-off-by: Ivo De Decker <ivodd@debian.org>

britney2/policies/policy.py

@@ -3,6 +3,7 @@ import logging
 import os
 import re
 import time
+from enum import IntEnum, unique
 from urllib.parse import quote
 
 import apt_pkg
@@ -747,6 +748,15 @@ class PiupartsPolicy(BasePolicy):
         return summary
 
 
+@unique
+class BuildDepResult(IntEnum):
+    # relation is satisfied in target
+    OK = 1
+    # relation can be satisfied by other packages in source
+    DEPENDS = 2
+    # relation cannot be satisfied
+    FAILED = 3
+
 class BuildDependsPolicy(BasePolicy):
 
     def __init__(self, options, suite_info):