__BUGZILLA_LOG_FILE -> PYTHONBUGZILLA_LOG_FILE

Rename the environment variable for better expression:point_left:

Author: SonicStark

bugzilla/_mi.py

@@ -52,7 +52,7 @@
 
 log = logging.getLogger(bugzilla.__name__)
 
-DEFAULT_BZ_LOG = os.getenv("__BUGZILLA_LOG_FILE") or os.path.join(
+DEFAULT_BZ_LOG = os.getenv("PYTHONBUGZILLA_LOG_FILE") or os.path.join(
     os.path.dirname(os.path.abspath(__file__)), 
     datetime.datetime.now().strftime("../BZMI%y%m%d%H%M%S.log"))