warning users about data loss only in conditions where that actually occurs
Merge pull request #301 from shatterednirvana/warn-correctly-on-data-loss

warning users about data loss only in conditions where that actually occurs
Sometimes EC2 response to security group actions is failure, but the action succeeds.  This fix catches and ignores the errors.
Merge pull request #303 from briandrawert/retry-auth-on-ec2-security-groups2

Retry auth on ec2 security groups