Allow specifying log directory as environment var

Signed-off-by: Patrick Uiterwijk <[email protected]>

keylime/keylime_logging.py

@@ -42,7 +42,7 @@ def log_http_response(logger, loglevel, response_body):
 LOG_TO_FILE = ['registrar', 'provider_registrar', 'cloudverifier']
 # not clear that this works right.  console logging may not work
 LOG_TO_STREAM = ['tenant_webapp']
-LOGDIR = '/var/log/keylime'
+LOGDIR = os.getenv('KEYLIME_LOGDIR', '/var/log/keylime')
 if not config.REQUIRE_ROOT:
     LOGSTREAM = './keylime-stream.log'
 else: