tests/phabricator/phabread-conduit-error.json

discovery: simplify the building of the children mapping

Since we only care about the revisions inside the set we are sampling, we can
use simpler code (and probably sightly faster).

{
    "interactions": [
        {
            "response": {
                "body": {
                    "string": "{\"result\":null,\"error_code\":\"ERR-INVALID-AUTH\",\"error_info\":\"API token \\\"cli-notavalidtoken\\\" has the wrong length. API tokens should be 32 characters long.\"}"
                }, 
                "headers": {
                    "expires": [
                        "Sat, 01 Jan 2000 00:00:00 GMT"
                    ], 
                    "x-content-type-options": [
                        "nosniff"
                    ], 
                    "set-cookie": [
                        "phsid=A%2F6jvmizfvgaa6bkls264secsim5nlgid4vj55jpe6; expires=Thu, 14-Sep-2023 04:38:21 GMT; Max-Age=157680000; path=/; domain=phab.mercurial-scm.org; secure; httponly"
                    ], 
                    "x-xss-protection": [
                        "1; mode=block"
                    ], 
                    "content-type": [
                        "application/json"
                    ], 
                    "cache-control": [
                        "no-store"
                    ], 
                    "date": [
                        "Sat, 15 Sep 2018 04:38:21 GMT"
                    ], 
                    "strict-transport-security": [
                        "max-age=0; includeSubdomains; preload"
                    ], 
                    "server": [
                        "Apache/2.4.10 (Debian)"
                    ], 
                    "x-frame-options": [
                        "Deny"
                    ]
                }, 
                "status": {
                    "message": "OK", 
                    "code": 200
                }
            }, 
            "request": {
                "body": "api.token=cli-notavalidtoken&ids%5B0%5D=4480", 
                "headers": {
                    "content-type": [
                        "application/x-www-form-urlencoded"
                    ], 
                    "content-length": [
                        "44"
                    ], 
                    "user-agent": [
                        "mercurial/proto-1.0 (Mercurial 4.7.1+861-aa7e312375cf)"
                    ], 
                    "accept": [
                        "application/mercurial-0.1"
                    ], 
                    "host": [
                        "phab.mercurial-scm.org"
                    ]
                }, 
                "method": "POST", 
                "uri": "https://phab.mercurial-scm.org//api/differential.query"
            }
        }
    ], 
    "version": 1
}