Fix link speed calculation in UI
Fix link speed calculation in UI

Issue: https://github.com/Juniper/warp17/issues/17

Performance results:
2017-01-04 12:04:28,928 - TestPerf - INFO - Test test_1_4M_tcp_sess_setup_rate
2017-01-04 12:05:30,524 - TestPerf - INFO - Average Rate 3411954
2017-01-04 12:05:30,524 - TestPerf - INFO - Test test_2_8M_tcp_sess_setup_rate
2017-01-04 12:07:06,532 - TestPerf - INFO - Average Rate 3402748
2017-01-04 12:07:06,532 - TestPerf - INFO - Test test_3_10M_tcp_sess_setup_rate
2017-01-04 12:09:00,493 - TestPerf - INFO - Average Rate 3398768
2017-01-04 12:09:00,493 - TestPerf - INFO - Test test_4_4M_tcp_sess_data_10b_setup_rate
2017-01-04 12:10:10,062 - TestPerf - INFO - Average Rate 1781828
2017-01-04 12:10:10,062 - TestPerf - INFO - Test test_5_4M_tcp_sess_data_1024b_setup_rate
2017-01-04 12:11:19,654 - TestPerf - INFO - Average Rate 1763230
2017-01-04 12:11:19,654 - TestPerf - INFO - Test test_6_4M_tcp_sess_data_1300b_setup_rate
2017-01-04 12:12:29,246 - TestPerf - INFO - Average Rate 1906777
2017-01-04 12:12:29,246 - TestPerf - INFO - Test test_7_4M_udp_sess_data_10b_setup_rate
2017-01-04 12:13:22,361 - TestPerf - INFO - Average Rate 7328274
2017-01-04 12:13:22,361 - TestPerf - INFO - Test test_8_4M_http_sess_data_10b_setup_rate
2017-01-04 12:14:31,167 - TestPerf - INFO - Average Rate 1753445
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