Creates EC2 Instance

def _create_ec2_instance():
    """
    Creates EC2 Instance
    """
    print(_yellow("Creating instance"))
    conn = boto.ec2.connect_to_region(ec2_region, aws_access_key_id=fabconf['AWS_ACCESS_KEY'], aws_secret_access_key=fabconf['AWS_SECRET_KEY'])

    image = conn.get_all_images(ec2_amis)

    reservation = image[0].run(1, 1, ec2_keypair, ec2_secgroups,
        instance_type=ec2_instancetype)

    instance = reservation.instances[0]
    conn.create_tags([instance.id], {"Name":fabconf['INSTANCE_NAME_TAG']})
    
    while instance.state == u'pending':
        print(_yellow("Instance state: %s" % instance.state))
        time.sleep(10)
        instance.update()

    print(_green("Instance state: %s" % instance.state))
    print(_green("Public dns: %s" % instance.public_dns_name))
    
    return instance.public_dns_name