Description of problem:
Meet error 'cannot get path "/swagger-2.0.0.pb-v1"' when run v3.9 `oc explain` resource against old server (e.g. v3.7). Other oc command does not replicate this.
It is not met when using oc v3.9 against openshift v3.9, or v3.7 against v3.7

Version-Release number of selected component (if applicable):
oc v3.9.0-0.24.0 against openshift v3.7.26

How reproducible:
Always

Steps to Reproduce:
1. Use oc v3.9 login v3.7 server
2. Run v3.9 `oc explain pod`
Error from server (Forbidden): User "xxia" cannot get path "/swagger-2.0.0.pb-v1": User "xxia" cannot "get" on "/swagger-2.0.0.pb-v1"

Actual results:
2. More log info:
$ oc explain pod --loglevel 6
I0126 16:24:35.047529    1714 round_trippers.go:436] GET https://MASTER:8443/swagger-2.0.0.pb-v1 403 Forbidden in 1013 milliseconds
I0126 16:24:35.048949    1714 helpers.go:201] server response object: [{
  "metadata": {},
  "status": "Failure",
  "message": "User \"xxia\" cannot get path \"/swagger-2.0.0.pb-v1\": User \"xxia\" cannot \"get\" on \"/swagger-2.0.0.pb-v1\"",
  "reason": "Forbidden",
  "details": {
    "causes": [
      {
        "reason": "UnexpectedServerResponse",
        "message": "User \"xxia\" cannot get path \"/swagger-2.0.0.pb-v1\": User \"xxia\" cannot \"get\" on \"/swagger-2.0.0.pb-v1\""
      }
    ]
  },
  "code": 403
}]
F0126 16:24:35.052265    1714 helpers.go:119] Error from server (Forbidden): User "xxia" cannot get path "/swagger-2.0.0.pb-v1": User "xxia" cannot "get" on "/swagger-2.0.0.pb-v1"

Expected results:
2. Command should work

Additional info: