Add test stats output when stopping with CTRL+C

[jwbensley]

ISSUE TYPE

• Bug Report
• Enhancement/Feature Request
• Question

VERSION DETAILS

Etherate version 0.13.beta 2017-07

SUMMARY

Quitting with CTRL+C before a running test has finished means that no "stats" are printed for the portion of a test that as run so far.

STEPS TO REPRODUCE

bensley@ubuntu-laptop:~/C/github/etherate/Etherate$ sudo ./etherate -i lo -g -G
[sudo] password for bensley: 
Running in TX mode
Using device lo with address 00:00:00:00:00:00, interface index 1

Physical interface MTU unknown, test might exceed physical MTU!

Entering promiscuous mode
Source MAC 00:00:5e:00:00:01
Destination MAC 00:00:5e:00:00:02
Sending gratuitous broadcasts...
Done.
Frame size is 1514 bytes
Starting test on Sun Sep 24 15:30:51 2017

Seconds		Mbps Tx		MBs Tx		FrmTx/s		Frames Tx
1		971.18		115		80932		80932
2		9900.89		1296		825074		906006
3		9684.61		2450		807051		1713057
^CQuitting...
Leaving promiscuous mode

The stats that are printed when a test is fully completed (such as min/max/avg, frame counts etc) should be printed even when a test is stopped prematurely.

[jwbensley]

Implemented in version 1.15.