misc: Fix python scripts shebang line

Type: fix

Since CentOS 8, RPM build script doesn't accept '#!/usr/bin/env python'
as a valid shebang line.  It requires scripts to explicitly chose
between python2 or python3.

Change all to use python3 as suggested by Paul Vinciguerra.

Depends-On: https://gerrit.fd.io/r/23170

Signed-off-by: Renato Botelho do Couto <renato@netgate.com>
Change-Id: Ie72af9f60fd0609e07f05b70f8d96e738b2754d1
diff --git a/test/patches/scapy-2.4/geneve.patch b/test/patches/scapy-2.4/geneve.patch
index 92752f1..6db3667 100644
--- a/test/patches/scapy-2.4/geneve.patch
+++ b/test/patches/scapy-2.4/geneve.patch
@@ -4,7 +4,7 @@
 --- /dev/null
 +++ b/scapy/layers/geneve.py
 @@ -0,0 +1,50 @@
-+#! /usr/bin/env python
++#! /usr/bin/env python3
 +# (GENEVE):
 +# A Framework for Overlaying Virtualized Layer 2 Networks over Layer 3 Networks
 +