* Restart Ethernet link if not active before discarding flash mode

fix eiger_flash

* FileObject mode must be 'r|w', must not be closed at end

* Receiver listener and writer threads
* Lima plugin and processing threads
* Other OS processes
* NetDevGroup queues rps_cpus

* Add boot_recovery script and z_mem[_write] executables
  * Including SSH copy into detector filesystem if needed
* Check ping and SSH connectivity
* Implement Extreme switch port disable/enable for Eiger-2M (telnet)
* Using subprocess and fileobject modules from gevent