Basic CAN configuration option for Bitrate and CAN FD

[mirenz1]

This story covers a subset of CAN bus configuration options mentioned in #128

Most common modifications of a CAN bus configuration is

• bitrate
• sample_point (optional)
• CAN FD

The peer configuration shall be extended to support configuration of this basic CAN configurations in LEA and CLEO (will be done with #232).

If the selected peer network interface is CAN,

• the user can choose if it is a normal CAN interface or a CAN FD interface
• if a normal CAN interface is selected,
  • then the bitrate can be configured in kbaud
• if a CAN FD interface is selected,
  • then the bitrate and the data bitrate can be selected in kbaud

When EDGAR receives the peer configuration for CAN interfaces, it configures SocketCAN interfaces as follwos

1. shut down the interface
   ip link set can0 down
2. Configure CAN interface

• normal CAN interface
  ip link set can0 type can bitrate 500000 fd off
• CAN FD
  ip link set can0 type can bitrate 500000 dbitrate 500000 fd on

3. activate the interface
   ip link set can0 up

[mbfm]

Completed in #296.