apiKeys do not work with shared apiGateway

[jimmyn]

This is a Bug Report

Description

When trying to deploy a service that uses apiKeys and shared apiGateway it returns an error:

 An error occurred: ApiGatewayApiKey1 - Value of property RestApiId must be of type String.

Using the following config:

provider:
  name: aws
  runtime: nodejs8.10
  apiKeys:
    - privateApiKey

  apiGateway:
     restApiId: xxxxxxxx
     restApiRootResourceId: yyyyyyyy

Shared apiGateway works fine without apiKeys, and apiKeys work without shared apiGateway.

Full stack trace:

ServerlessError: An error occurred: ApiGatewayApiKey1 - Value of property RestApiId must be of type String.
    at provider.request.then (/Users/dmitriy/.config/yarn/global/node_modules/serverless/lib/plugins/aws/lib/monitorStack.js:112:33)
From previous event:
    at AwsDeploy.monitorStack (/Users/dmitriy/.config/yarn/global/node_modules/serverless/lib/plugins/aws/lib/monitorStack.js:26:12)
    at provider.request.then (/Users/dmitriy/.config/yarn/global/node_modules/serverless/lib/plugins/aws/lib/updateStack.js:95:30)
From previous event:
    at AwsDeploy.update (/Users/dmitriy/.config/yarn/global/node_modules/serverless/lib/plugins/aws/lib/updateStack.js:95:8)
From previous event:
    at AwsDeploy.BbPromise.bind.then (/Users/dmitriy/.config/yarn/global/node_modules/serverless/lib/plugins/aws/lib/updateStack.js:112:12)
From previous event:
    at AwsDeploy.updateStack (/Users/dmitriy/.config/yarn/global/node_modules/serverless/lib/plugins/aws/lib/updateStack.js:106:8)
From previous event:
    at AwsDeploy.BbPromise.bind.then (/Users/dmitriy/.config/yarn/global/node_modules/serverless/lib/plugins/aws/deploy/index.js:129:39)
From previous event:
    at Object.aws:deploy:deploy:updateStack [as hook] (/Users/dmitriy/.config/yarn/global/node_modules/serverless/lib/plugins/aws/deploy/index.js:125:10)
    at BbPromise.reduce (/Users/dmitriy/.config/yarn/global/node_modules/serverless/lib/classes/PluginManager.js:390:55)
From previous event:
    at PluginManager.invoke (/Users/dmitriy/.config/yarn/global/node_modules/serverless/lib/classes/PluginManager.js:390:22)
    at PluginManager.spawn (/Users/dmitriy/.config/yarn/global/node_modules/serverless/lib/classes/PluginManager.js:408:17)
    at AwsDeploy.BbPromise.bind.then (/Users/dmitriy/.config/yarn/global/node_modules/serverless/lib/plugins/aws/deploy/index.js:95:48)
From previous event:
    at Object.deploy:deploy [as hook] (/Users/dmitriy/.config/yarn/global/node_modules/serverless/lib/plugins/aws/deploy/index.js:91:10)
    at BbPromise.reduce (/Users/dmitriy/.config/yarn/global/node_modules/serverless/lib/classes/PluginManager.js:390:55)
From previous event:
    at PluginManager.invoke (/Users/dmitriy/.config/yarn/global/node_modules/serverless/lib/classes/PluginManager.js:390:22)
    at PluginManager.run (/Users/dmitriy/.config/yarn/global/node_modules/serverless/lib/classes/PluginManager.js:421:17)
    at variables.populateService.then.then (/Users/dmitriy/.config/yarn/global/node_modules/serverless/lib/Serverless.js:157:33)
    at runCallback (timers.js:763:18)
    at tryOnImmediate (timers.js:734:5)
    at processImmediate (timers.js:716:5)
    at process.topLevelDomainCallback (domain.js:102:23)
From previous event:
    at Serverless.run (/Users/dmitriy/.config/yarn/global/node_modules/serverless/lib/Serverless.js:144:8)
    at serverless.init.then (/Users/dmitriy/.config/yarn/global/node_modules/serverless/bin/serverless:43:50)
    at <anonymous>

Similar or dependent issues:

• ApiGateway ApiKeys are not working #137
• Closes #130 Shared API Gateway and maxAge property support for HTTP Endpoints #131