Google Storage badly handles authentication parameters

When configuring nuxeo.conf to configure the Google Storage, it ends up than we need to copy-paste the whole JSON file generated by Google Cloud Console. It implies severals problems:

• Authentication Information are repeated (as the JSON contains the bucket name, bucket region...)
• The JSON is not read correctly "as it" and generates the following error:

Caused by: com.fasterxml.jackson.core.JsonParseException: Illegal unquoted character ((CTRL-CHAR, code 10)): has to be escaped using backslash to be included in string value
 at [Source: (ByteArrayInputStream); line: 1, column: 161]

This is because double backslashes are badly interpreted. So we need to adapt the JSON manually and remove one "\".

Original and Modified JSON in comment.