Noisily fail when rotate credentials
Noisily fail when rotate credentials

While reviewing the current PR we noticed that the rotation of
credentials and certificates is not working as expected.

Some symptoms where that the CF admin user was block, and errors
when accessing some endpoints of CF (see below).

Error when calling `cf curl /v2/organizations/c0f77ba4-5daf-4f3c-a788-dbdd5d7ef372/spaces?order-by=name&inline-relations-depth=1`:

  {"timestamp":1519898481.2078676,"message":"Request failed: 500: {\"error_code\"=>\"UnknownError\", \"description\"=>\"An unknown error occurred.\", \"code\"=>10001, \"test_mode_info\" =>{\"description\"=>\"bad decrypt\", \"error_code\"=>\"CF-CipherError\" …

alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf