Chaining publish and unpublish Commands Changes Their Default Behavior

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## Describe the bug

Chaining `publish` and `unpublish` commands changes their default behavior in relation to staging/production hosts.

## Expected Behavior
Commands `publish` and `unpublish` should **always** default to staging when `production_host` and `staging_host` are defined under `binary` in package.json.

## Actual Behavior

When the commands `publish` and `unpublish` are executed by themselves they default to staging. However, if the command being executed is chained after another command (for example `package publish` or `info unpublish`) then the default reverts to `binary.production_host`. As a result - **accidental publishing/unpublishing is possible**.

## Steps to Reproduce

### 1) Prep package.json
Replace "host" with `staging_host` and `production_host` in package.json

Example:
```
"staging_host": "https://apm-appoptics-bindings-node-dev-staging.s3.us-east-1.amazonaws.com",
"production_host": "https://apm-appoptics-bindings-node-dev-production.s3.us-east-1.amazonaws.com",
```

### 2) Run Commands one after the other
`node-pre-gyp package`
`node-pre-gyp publish`

Results in: ✅
```
[node-pre-gyp-test-app1] published to https://apm-appoptics-bindings-node-dev-staging.s3.us-east-1.amazonaws.com/node-pre-gyp/node-pre-gyp-test-app1/v0.1.0/Release/
```

`node-pre-gyp info`
`node-pre-gyp unpublish`

Results in: ✅
```
[node-pre-gyp-test-app1] Success: removed https://apm-appoptics-bindings-node-dev-staging.s3.amazonaws.com/node-pre-gyp/node-pre-gyp-test-app1/v0.1.0/Release/node-v83-darwin-x64.tar.gz
```

### 3) Run Chained Commands
`node-pre-gyp package publish`

Results in: ❌
```
[node-pre-gyp-test-app1] published to https://apm-appoptics-bindings-node-dev-production.s3.us-east-1.amazonaws.com/node-pre-gyp/node-pre-gyp-test-app1/v0.1.0/Release/
```

`node-pre-gyp info unpublish`

Results in: ❌
```
[node-pre-gyp-test-app1] Success: removed https://apm-appoptics-bindings-node-dev-production.s3.amazonaws.com/node-pre-gyp/node-pre-gyp-test-app1/v0.1.0/Release/node-v83-darwin-x64.tar.gz
```
## Root Cause
When chained commands are executed, the first command in the chain will [raise the `binaryHostSet` flag](https://github.com/mapbox/node-pre-gyp/blob/master/lib/node-pre-gyp.js#L275). Subsequent `publish` or `unpublish` [will trigger the early return](https://github.com/mapbox/node-pre-gyp/blob/master/lib/node-pre-gyp.js#L247). Due to the early return, the host will not be configured correctly resulting in the bug described above.

Commencez dans lib/node-pre-gyp.js, au niveau de la gestion de binaryHostSet autour des lignes 247 et 275, puis reproduisez le problème avec les valeurs staging_host et production_host de package.json indiquées. Vérifiez le correctif avec des commandes publish/unpublish autonomes et chaînées ; les commandes chaînées doivent utiliser staging par défaut plutôt que production.

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