This fix updates:
- github.com/miekg/dns from 1.1.12 to 1.1.14
- google.golang.org/grpc from 1.21.0 to 1.21.1
- github.com/aws/aws-sdk-go from 1.19.41 to 1.20.3
- github.com/prometheus/common from 0.4.1 to 0.6.0
- gopkg.in/DataDog/dd-trace-go.v1 from 1.14.0 to 1.15.0

This fix fixes #2899
This fix fixes #2900
This fix fixes #2901
This fix fixes #2902
This fix fixes #2903
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>