[FAB-14424] Fix test flake TestMetrics

This change set fixes the test flake by ensuring that
we continuously send until the buffer overflow is reported.

Ran it 1000 times and it passes.

Change-Id: I2b1dec09457a16fbf8e15c79c88fb55ca6e6393e
Signed-off-by: yacovm <yacovm@il.ibm.com>
3 jobs for fabric-release-1.4
Status Name Job ID Coverage
failed build #7589

skipped code_quality #7591
allowed to fail
skipped test #7590
Name Stage Failure
build Build There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job log