base-base-images: Use https for yum repo
buildlogs.centos.org is now on https.  yum failed to follow the
http to https redirect, so change the URL to https to avoid the redirect:
[Errno 14] HTTPS Error 302 - Found
[centos-paas-sig-openshift-origin36]
name = CentOS PaaS SIG Origin 3.6 Repository
-baseurl = http://buildlogs.centos.org/centos/7/paas/x86_64/openshift-origin36/
+baseurl = https://buildlogs.centos.org/centos/7/paas/x86_64/openshift-origin36/
enabled = 1
gpgcheck = 0
sslverify = 0
