Revert "Use python 3 for utilities"

This reverts commit 76c6c50405, which broke the obs builds. I'm really starting to get annoyed by ongoing python related breakage without ever fixing any bugs!

Change-Id: I4d76e897d4f746ff9ea4e06f2efc708a12cc2944

debian/control

@@ -15,7 +15,7 @@ Build-Depends: debhelper (>= 9),
                libpcsclite-dev,
                pkg-config,
                libtalloc-dev,
-               python3
+               python (>= 2.7.6)
 Standards-Version: 3.9.8
 Vcs-Git: git://git.osmocom.org/libosmocore.git
 Vcs-Browser: http://git.osmocom.org/gitweb?p=libosmocore.git;a=summary

utils/conv_codes_gsm.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/python2
 # -*- coding: utf-8 -*-
 from conv_gen import ConvolutionalCode
 from conv_gen import poly

utils/conv_gen.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/python2
 
 mod_license = """
 /*