project-lakitu: replace iperf2 with iperf3 in the dev image

iperf3 is the next version of the iperf network benchmarking tool,
rewritten from scratch and not backward-compatible with iperf2.
Unlike iperf2 iperf3 handles reverse test better in a situation
when there is a NAT between two DUTs.

BUG=b/182617200
TEST=presubmit
RELEASE_NOTE=None

Change-Id: Ia087dae394bd62563a10d8bf25c5224c3ac9f97f
Reviewed-on: https://cos-review.googlesource.com/c/cos/overlays/board-overlays/+/14291
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Roy Yang <royyang@google.com>
Reviewed-by: Dexter Rivera <riverade@google.com>
diff --git a/project-lakitu/virtual/target-lakitu-os-dev/target-lakitu-os-dev-1.5.ebuild b/project-lakitu/virtual/target-lakitu-os-dev/target-lakitu-os-dev-1.5.ebuild
index 04a8b1b..978adbe 100644
--- a/project-lakitu/virtual/target-lakitu-os-dev/target-lakitu-os-dev-1.5.ebuild
+++ b/project-lakitu/virtual/target-lakitu-os-dev/target-lakitu-os-dev-1.5.ebuild
@@ -59,7 +59,7 @@
 	dev-util/strace
 	net-analyzer/tcpdump
 	net-fs/sshfs
-	net-misc/iperf:2
+	net-misc/iperf:3
 	iputils_arping? ( net-misc/iputils )
 	net-misc/rsync
 	sys-apps/coreutils