Another attempt at fixing .deb

The previous efforts have failed: python3 does not supply
/usr/bin/python symlink. Let's use python-minimal dependency.

Change-Id: If9e3f31622efae132b25683c54ce09c83ce43415
diff --git a/debian/control b/debian/control
index 571c24e..0ff3801 100644
--- a/debian/control
+++ b/debian/control
@@ -8,7 +8,7 @@
                dh-systemd (>= 1.5),
                autotools-dev,
                pkg-config,
-               python3,
+               python-minimal,
                libosmocore-dev,
                libosmo-abis-dev,
                libosmo-netif-dev,