Log rotate

[MarinX]

Currently, go-ethereum log package does not support log rotating which can be issue on mobile devices.

The go-ethereum logger depends on the package log15

[tiabc]

@rasom do we allow status-go log output on mobile devices at all?

[pedropombeiro]

Regarding log15 and log rotation, this might be useful: inconshreveable/log15#133

@tiabc I wouldn't mind picking this up, but am wondering why this has been open for such a long time.

[pedropombeiro]

I'm almost finished with this GHI, just in case. It seems that geth log output is disabled by default by status-react: https://github.com/status-im/status-react/blob/develop/modules/react-native-status/android/src/main/java/im/status/ethereum/module/StatusModule.java#L180. I've asked a question related to another PR of mine, in case we want to enable geth logging by default, now that the level can be controlled independently by a feature flag.