Core generates a lot of logs during streaming

[shoamano83]

Currently SDL Core generates quite a few log lines each time it receives a frame from mobile. Because of this, we will get a large amount of logs during video streaming.

• Log files can be flushed away quickly.
• If the system has slow log output, log messages will queued up in memory and might cause system's RAM to exhaust.

[jacobkeeler]

Closing with the merge of #1778