Error upon deploying: AccessDeniedException: Cross-account pass role is not allowed.

Our accounts are setup via an organisational accounts, with no users directly in development accounts. This is a common practice. Users switch role to desired accounts.

Perhaps this is the reason when deploying in a development account.

```
chaos-lambda deploy -r arn:aws:iam::50000000:role/ChaosLambda-Accessrole
AWS_REGION not set, defaulting to eu-west-1
Something went wrong:
{ AccessDeniedException: Cross-account pass role is not allowed.
at Object.extractError (/usr/local/lib/node_modules/chaos-lambda/node_modules/aws-sdk/lib/protocol/json.js:43:27)
at Request.extractError (/usr/local/lib/node_modules/chaos-lambda/node_modules/aws-sdk/lib/protocol/rest_json.js:37:8)
at Request.callListeners (/usr/local/lib/node_modules/chaos-lambda/node_modules/aws-sdk/lib/sequential_executor.js:105:20)
at Request.emit (/usr/local/lib/node_modules/chaos-lambda/node_modules/aws-sdk/lib/sequential_executor.js:77:10)
at Request.emit (/usr/local/lib/node_modules/chaos-lambda/node_modules/aws-sdk/lib/request.js:596:14)
at Request.transition (/usr/local/lib/node_modules/chaos-lambda/node_modules/aws-sdk/lib/request.js:21:10)
at AcceptorStateMachine.runTo (/usr/local/lib/node_modules/chaos-lambda/node_modules/aws-sdk/lib/state_machine.js:14:12)
at /usr/local/lib/node_modules/chaos-lambda/node_modules/aws-sdk/lib/state_machine.js:26:10
at Request. (/usr/local/lib/node_modules/chaos-lambda/node_modules/aws-sdk/lib/request.js:37:9)
at Request. (/usr/local/lib/node_modules/chaos-lambda/node_modules/aws-sdk/lib/request.js:598:12)
message: 'Cross-account pass role is not allowed.',
code: 'AccessDeniedException',
time: 2019-06-21T13:53:13.545Z,
requestId: 'e992148c-942b-11e9-9727-097a78ea9fd9',
statusCode: 403,
retryable: false,
```

Start by reproducing the documented `chaos-lambda deploy -r arn:aws:iam::50000000:role/ChaosLambda-Accessrole` command with AWS_REGION unset, then trace the deploy entry point and its AWS role handling. The issue provides no repository file or test location and does not define an expected result, so completion criteria need to be established for deployments from switched roles in development accounts.

Written by the indexing model from the issue text.