Read body to reuse TCP connection

[yashgandhi-32]

As per docs

// HTTP client gurantee that body is always
// no nil. The default HTTP client's Transport may not
// reuse "keep-alive" TCP connections if the Body is
// not read to completion and closed.

To ensure http.Client connection reuse

• Read until complete (ex ioutil.ReadAll(resp.Body)) and close the body

[cockroach-teamcity]

This change is