iperf3: updated versions from 3.6 to 3.16 (spack#44152)

* Update version of iperf3 from 3.6 to 3.16

Spack currently only explicitly has version 3.6 of the iPerf3 package
(out of ESnet / LBNL). This makes the default the latest version of 3.16,
and adds some other versions (found in some Linux distros, for possible
compatibility purposes).

* iperf3: update to 3.17; update 3.6 hash for new url

* protobuf: update hash for patch needed when="@3.4:3.21"

* Revert "protobuf: update hash for patch needed when="@3.4:3.21""

This reverts commit 4d168d0.

var/spack/repos/builtin/packages/iperf3/package.py

@@ -12,8 +12,13 @@ class Iperf3(AutotoolsPackage):
     maintained project."""
 
     homepage = "https://software.es.net/iperf/"
-    url = "https://github.com/esnet/iperf/archive/3.6.tar.gz"
+    url = "https://downloads.es.net/pub/iperf/iperf-3.17.tar.gz"
 
     license("BSD-3-Clause-LBNL")
 
-    version("3.6", sha256="1ad23f70a8eb4b892a3cbb247cafa956e0f5c7d8b8601b1d9c8031c2a806f23f")
+    version("3.17", sha256="077ede831b11b733ecf8b273abd97f9630fd7448d3ec1eaa789f396d82c8c943")
+    version("3.16", sha256="cc740c6bbea104398cc3e466befc515a25896ec85e44a662d5f4a767b9cf713e")
+    version("3.14", sha256="723fcc430a027bc6952628fa2a3ac77584a1d0bd328275e573fc9b206c155004")
+    version("3.12", sha256="72034ecfb6a7d6d67e384e19fb6efff3236ca4f7ed4c518d7db649c447e1ffd6")
+    version("3.9", sha256="24b63a26382325f759f11d421779a937b63ca1bc17c44587d2fcfedab60ac038")
+    version("3.6", sha256="de5d51e46dc460cc590fb4d44f95e7cad54b74fea1eba7d6ebd6f8887d75946e")