fcstats.pl seems to report nothing on RHEL 6.9

[ofalk]

Received feedback per mail:

host1  [0x20000090faba42de]: RX:          0 MB (   0.00 MB/s), TX:          0 MB (   0.00 MB/s)
host2  [0x20000090faba42df]: RX:          0 MB (   0.00 MB/s), TX:          0 MB (   0.00 MB/s)
host3  [0x20000090fab8ede6]: RX:          0 MB (   0.00 MB/s), TX:          0 MB (   0.00 MB/s)
host4  [0x20000090fab8ede7]: RX:          0 MB (   0.00 MB/s), TX:          0 MB (   0.00 MB/s)

host1  [0x20000090faba42de]: RX:          0 MB (   0.00 MB/s), TX:          0 MB (   0.00 MB/s)
host2  [0x20000090faba42df]: RX:          0 MB (   0.00 MB/s), TX:          0 MB (   0.00 MB/s)
host3  [0x20000090fab8ede6]: RX:          0 MB (   0.00 MB/s), TX:          0 MB (   0.00 MB/s)
host4  [0x20000090fab8ede7]: RX:          0 MB (   0.00 MB/s), TX:          0 MB (   0.00 MB/s)