Merge ~rodsmith/plainbox-provider-certification-server:fix-precheck-iperf-delay into plainbox-provider-certification-server:master

[Rod Smith]

Add a 5-second timeout to the iperf3 check in canonical-certification-precheck

I used the bash "timeout" feature because, although some versions of iperf3 support a --connect-timeout option that should do the job, that's not supported in all versions of iperf3.

[Jeff Lane  (bladernr)]

LGTM. Maybe in the future we can change this to use the built in function, but this is good. Thanks for addressing this.

review: Approve

diff --git a/tools/canonical-certification-precheck b/tools/canonical-certification-precheck
index c3a1c04..b5337d0 100755
--- a/tools/canonical-certification-precheck
+++ b/tools/canonical-certification-precheck
@@ -573,7 +573,7 @@ fi
 local iperf3found=0
 for iperfserver in $(grep ^TEST_TARGET_IPERF /etc/xdg/canonical-certification.conf | cut -d = -f 2 | sed s/,/\\n/g)
         do
-                iperf3 -c $iperfserver -n 1 >/dev/null 2>&1
+                timeout 5 iperf3 -c $iperfserver -n 1 >/dev/null 2>&1
                 if [ $? = 0 ]; then
                         echo " Iperf3 server found on port 5201 on $iperfserver"
                         iperf3found=1