Serial output is affected by telnet debug level

[jeroenst]

Describe the bug
By default serial only outputs the initial level (debug). When the debug level is changed through telnet the serial level is also changed.

To Reproduce
Steps to reproduce the behavior:

1. Upload a project with remote debug
2. Open serial console
3. Login via telnet and change debug level and see how the output on the serial console is affected

Expected behavior
The serial console should not be affected by the telnet debug level. It should output all levels by default and it should be possible to change the level for serial logging it in code.

Screenshots
If applicable, add screenshots to help explain your problem.

Arduino Information:

• OS: Linux Mint 19.2
• IDE Arduino IDE
• IDE 1.8.10
• Board ESP8266

Additional context
None.

[tablatronix]

This is a feature request not a bug, it is clearly described that serial output is a mirror, so this is expected behavior atm.