Add maxLogFiles option (#6296)

https://community.parseplatform.org/t/server-log-retention/867/2

Maximum number of logs to keep. If not set, no logs will be removed. This can be a number of files or number of days. If using days, add 'd' as the suffix. (default: null).

I'll run this in production for a few days. I assume it works.

Useful for saving disk space.

Update winston-daily-rotate-file package to 4.4.0

package.json

@@ -54,7 +54,7 @@
     "tv4": "1.3.0",
     "uuid": "3.3.3",
     "winston": "3.2.1",
-    "winston-daily-rotate-file": "3.10.0",
+    "winston-daily-rotate-file": "4.4.0",
     "ws": "7.2.1"
   },
   "devDependencies": {