All egress traffic allowed by default should be implied

All egress traffic allowed by default should be implied

This commit removes the egress rules that were created by default
to align with the way security groups work in amazon VPC.
"By default, all egress is allowed from the security
group until you add outbound rules to the group (then only the egress you
specified is allowed)."

Change-Id: I63936fbf76ea9a2828c8923be6ec14aac46b21bd