Restore download URLs to use https

Commit bfcb2ff732ffdf2ed50be6a677f1b6182a0213a4 changes the scheme on
two download URLs to use http.  Restore https.

Cherry-picked from https://review.openstack.org/#/c/130394/
1a4cd228829baecb4b5fd301aa7c4035f9105cdb

Change-Id: I41d498b4444f8a641ab15f11da082370c1c80d07