fixes #426 expose BMC information in foreman UI

Signed-off-by: Ohad Levy <ohadlevy@gmail.com>

This patch also adds an abstracted power management class for both VM
and BM

fixes #1876 fix display of instance name and dns for AWS Use instance number when instances name is not set. Use private DNS entry when public dns is not available

[refactor] - simple method to display ec2 instance name, instead of using tags everywhere

fixes #1667 - restrcutre fog extensions code