Request log configuration and parameter filtering - EUCA-9256

A cloud property is added to allow the request log to be disabled when
not required.

The logged request parameters / body can now be filtered to remove
or modify content. Filtering is added for the IAM and Properties
services to redact sensitive information.

EUCA-9256
Hide value for bootstrap.webservices.ssl.server_password - EUCA-9987
Turn off debug logging of messages in cloud-exhaust.log - EUCA-10022
Remove request message trace logging - EUCA-10022
Merge branch 'maint/4.0/testing' into maint/4.0/security
Merge branch 'maint/4.0/testing' into maint/4.0/security