Userid and password login using GET operation

Performs basic authentication using Acoustic ID credentials. The API responds with authentication token (set in the cookie) and tenant information in the response header x-ibm-dx-tenant-id/x-cms-tenant-id. If no tenant for the user is found, the authentication fails presenting a HTTP404 error. You can also use API key generated by MyAcoustic page, in which case username is AcousticAPIKey while generating the Base64 encoded Authorization header.<br />User roles: admin, manager, editor, viewer, authenticatedVisitor, anonymous