Update to pinning sequence

[wesketchum]

Due to the configuration issues on threading in the ethernet readout, we need to apply separate pinning files from config through run start to enabling triggers. A typical sequence is like:

boot
pin_threads <conf_pining_file>
conf
start
pin_threads <running_pinning_file>
enable_triggers

It would be good to reflect this in the start_run command, and likely provide in configuration two pinning files: one for conf and one for running.

[plasorak]

DUNE-DAQ/nanorc#243 and DUNE-DAQ/fddaqconf#20 should allow full configurability of the thread pinning script execution in the configuration.

[wesketchum]

working properly (I think) in the fddaq-v4.3.0-rc3 release candidate