Update FC/HBA statistics display functions

Update FC/HBA statistics display functions

Various fixes in function used to display FC/HBA statistics:
1) Only one function is necessary to display FC/HBA statistics. So
remove print_avg_fchost_stats() function.
2) At the end of the report, display average statistics per host, not a
summary.
3) Update column width used to display statistics (10 characters wide)
to be consistent with other activities display.
4) Move FCHOST column to the right because the host name length may be
greater than 10 characters.
5) Fix timestamp displayed with header line.
6) Remove extra carriage return at the end of display.

Signed-off-by: Sebastien GODARD <sysstat@users.noreply.github.com>