Failed reloads are not exposed through web API

[RichiH]

I reloaded via the web API and got:

foo@bar ~ % curl -X POST http://localhost:9090/-/reload
Reloading configuration file...%
foo@bar ~ %

While I saw an actual error on CLI:

    INFO[842745] Loading configuration file prometheus.yml     source=main.go:196
    ERRO[842745] Couldn't load configuration (-config.file=prometheus.yml): yaml: unmarshal errors:
  line 362: cannot unmarshal !!map into string  source=main.go:208

Exposing the error via the web API would help quite a bit.

[brian-brazil]

Dupe of #1425

[lock]

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