Deprecate default source_permissions :use on all platforms

Currently, puppet will copy the owner/group/mode from sourced files when those properties are unspecified. This leads to surprising results, e.g. PUP-1986.

We discussed changing the default behavior in https://groups.google.com/forum/#!msg/puppet-users/XNy8gI3jcf0/HufQkYQdKMAJ

This ticket is about issuing a deprecation warning when :source_permissions defaults to :use for all platforms. If the user explicitly specifies :use or :use_when_creating, then it should not generate a deprecation warning on POSIX agents. For Windows agents, it should continue to issue a deprecation warning as it already does.

In 4.0, the default value will be changed to :ignore for all platforms. See PUP-2613.