Revert "Use python 3 for utilities"

This reverts commit 76c6c50405c6cbb1d08bdd7b5d27c657fa5d38b6, 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
diff --git a/debian/control b/debian/control
index 2a6fd4a..64c4870 100644
--- a/debian/control
+++ b/debian/control
@@ -15,7 +15,7 @@
                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