1. move resource allocation from xxx_init to xxx_new 2. fix enabling tx checksum insertion by mistake 3. iperf example: enlarge max arguments 4. add examples for spi-ethernet Closes https://github.com/espressif/esp-idf/issues/3715 Closes https://github.com/espressif/esp-idf/issues/3711
1. Add support for new PHY IP101. 2. Re-enable GPIO0 output mode. 3. Clean up some docs.
1. Add command for Ethernet based on console component. 2. Make cmd_system and iperf a component that can be referenced by other examples 3. Add "version" command to cmd_system.c 4. Clean up the README.md in all ethernet examples[TW#26525]
