EC2 credentials: sed query was slightly incorrect

"s/aws_access = .*/aws_access = $ec2_user/g"
is now "s/aws_access =.*/aws_access = $ec2_user/g" (removed space)
and "s/aws_secret = .*/aws_secret = $ec2_pass/g" is now "s/aws_secret =.*/aws_secret = $ec2_pass/g" (removed space)