This fix updates:
- github.com/miekg/dns to 1.15 (#2947)
- github.com/aws/aws-sdk-go to 1.20.13 (#2953)
- google.golang.org/grpc to 1.22.0 (#2966)

This fix fixes #2947
This fix fixes #2953
This fix fixes #2966
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>