python: add hash file

Even though there's a hash at
https://www.python.org/downloads/release/python-279/ prefer using the
sig since that's just md5.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/python/python.hash

@@ -0,0 +1,2 @@
+# Locally calculated after checking pgp signature
+sha256	90d27e14ea7e03570026850e2e50ba71ad20b7eb31035aada1cf3def8f8d4916	Python-2.7.9.tar.xz