Sort for deterministic behaviour across Python versions

Author: Geoff Bache

TestSelf/Mocking/CaptureMock/Console/EnvironmentOnly/TargetApp/cpmock_env.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 
 import os
-for key, value in os.environ.items():
+for key, value in sorted(os.environ.items()):
     if key.startswith("TEXTTEST_CAPTUREMOCK_"):
         print(key, "=", value)