Log Message:
iperf3: updated to 3.11

iperf-3.11
----------
* Notable user-visible changes
  * Update links to Discussions in documentation
  * Fix DSCP so that TOS = DSCP * 4
  * Fix --bind-dev for TCP streams
  * Fix interface specification so doesn't overlap with IPv6 link-local \ 
addresses for -c and -B
  * Add get/set test_unit_format function declaration to iperf_api.h
  * Auto adjustment of test-end condition for file transfers (-F), if no end \ 
condition is set, it will automatically adjust it to file size in bytes
  * Exit if idle time expires waiting for a connection in one-off mode
  * Support zerocopy by reverse mode
  * Update help and manpage text for 1157, support bind device
  * Consistently print target_bandwidth in JSON start section
  * Test bitrate added to JSON output
  * Remove fsync call after every write to receiving --file
  * Update documentation for -w
  * Fix for 952, different JSON object names for bidir reverse channel