Remove security group egress rules

The egress security group rules were too restrictive, blocking
necessary traffic, including cloud-init metadata.
Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1080638

Change-Id: Ia11f4a81d56d76418530dab6b09478648a1cfbfd
Secure private repo files added to environment

The yum repo files had insecure settings for sslverify and
gpgcheck. Also change references to http to https.

Change-Id: I10cbc33a734f9ed36ef6f22174c65efaf3b659d7