Improve error log at initialization + minio only numbers access/pass

[richard-julien]

Description

With a specific minio env files with only numbers for access/secret, the platform fail to start with an empty error in the log.

Steps to create the smallest reproducible scenario:

1. Checkout docker compose file
2. Config env files with minio access/secret to only numbers
3. Start the stack

Expected Output

Platform starting without errors

Actual Output

$ node --max_old_space_size=8192 build/index.js
{"level":"info","message":"[OPENCTI] Starting platform","timestamp":"2021-01-13T03:14:40.246Z"}
{"level":"info","message":"[CHECK] ElasticSearch is alive","timestamp":"2021-01-13T03:14:40.275Z"}
{"error":{},"level":"error","message":"[OPENCTI] Platform initialization fail","timestamp":"2021-01-13T03:14:40.278Z"}

Additional information

Will also improve the error log. The error should be reported like this.
{"error":{"name":"UnknownError","data":{"message":"accessKey should be of type "string"","_stack":"TypeError: accessKey should be of type "string"\n .... }}

[richard-julien]

#994