freebsd: attempt to re-enable image

The freebsd 'pkg' packages specified by the install script
weren't able to be added to the image because the version
of pip has been upgraded to py39-pip.   Because pkg failed
to install that command, all other packages (including
the installation of openjdk11 which is needed for jenkins
remoting to run) were also not installed.

Finally, let's change the subnet over to the one jenkins
will actually be using in order to ensure that there aren't
any surprises getting ssh working.

Signed-off-by: Kelley Spoon <kelley.spoon@linaro.org>
Change-Id: Iad26171c6d02897bcf02a63fcd8283c380dd101a
diff --git a/freebsd.sh b/freebsd.sh
index 9bc3086..699b66a 100644
--- a/freebsd.sh
+++ b/freebsd.sh
@@ -17,7 +17,7 @@
     gmake \
     perl5 \
     bash \
-    py38-pip
+    py39-pip
 
 mount -t fdescfs fdesc /dev/fd
 mount -t procfs proc /proc
diff --git a/packer_freebsd.json b/packer_freebsd.json
index bc442c8..9a7b5ad 100644
--- a/packer_freebsd.json
+++ b/packer_freebsd.json
@@ -8,7 +8,7 @@
       "type": "amazon-ebs",
       "name": "freebsd-12.3-mbedtls",
       "vpc_id":  "vpc-d28c0ca9",
-      "subnet_id": "subnet-a0d573af",
+      "subnet_id": "subnet-5af5e23e ",
       "region": "{{user `vpc_region`}}",
       "source_ami_filter": {
         "filters": {