Fix xmt stats in Netdata output

[vlvkobal]

There was a difference in stats for received/transmitted packets when the Netdata protocol was used.

BEGIN fping.google_com_packets
SET xmt = 5
SET rcv = 5
END
BEGIN fping.google_com_quality
SET returned = 100
END
BEGIN fping.google_com_latency
SET min = 2793
SET avg = 2798
SET max = 2801
END
BEGIN fping.google_com_packets
SET xmt = 5
SET rcv = 4
END
BEGIN fping.google_com_quality
SET returned = 100
END
BEGIN fping.google_com_latency
SET min = 2781
SET avg = 2787
SET max = 2794
END
...
BEGIN fping.google_com_packets
SET xmt = 5
SET rcv = 4
END
BEGIN fping.google_com_quality
SET returned = 100
END
BEGIN fping.google_com_latency
SET min = 2789
SET avg = 2794
SET max = 2800
END
BEGIN fping.google_com_packets
SET xmt = 4
SET rcv = 4
END
BEGIN fping.google_com_quality
SET returned = 100
END
BEGIN fping.google_com_latency
SET min = 2790
SET avg = 2794
SET max = 2804
END
BEGIN fping.google_com_packets
SET xmt = 5
SET rcv = 5
END
BEGIN fping.google_com_quality
SET returned = 100
END
BEGIN fping.google_com_latency
SET min = 2786
SET avg = 2795
SET max = 2803
END

The correction for num_sent_i was moved to the appropriate place. The output for Netdata is sane now.

BEGIN fping.google_com_packets
SET xmt = 4
SET rcv = 4
END

[coveralls]

Coverage remained the same at 79.401% when pulling edf8475 on vlvkobal:develop into bc5017b on schweikert:develop.

[ilyam8]

It would be nice you swap received and sent. It is common pattern in netdata - received goes first and has green color.

[ilyam8]

bad currently: when green > red

after swap: when red > green

[schweikert]

Thanks!