Cloud Logging needs owner permissions on the bucket

[quartzmo]

What is the required Storage Bucket configuration to successfully create a Logging Sink?

Same as or similar to googleapis/google-cloud-python#1614 .

irb(main):004:0> bucket = storage.bucket "my-syslog-bucket"
=> #<Gcloud::Storage::Bucket:0x007fd144a3e2e8 @connection=Gcloud::Storage::Connection(---), @gapi=#<Google::APIClient::Schema::Storage::V1::Bucket:0x3fe8a251f1ec DATA:{"kind"=>"storage#bucket", "id"=>"my-syslog-bucket", "selfLink"=>"https://www.googleapis.com/storage/v1/b/my-syslog-bucket", "projectNumber"=>"---", "name"=>"my-syslog-bucket", "timeCreated"=>"2016-03-04T18:24:37.626Z", "updated"=>"2016-03-04T18:24:37.626Z", "metageneration"=>"1", "owner"=>{"entity"=>"project-owners----"}, "location"=>"US", "storageClass"=>"STANDARD", "etag"=>"CAE="}>>
irb(main):006:0> bucket.acl
=> #<Gcloud::Storage::Bucket::Acl:0x007fd142836678 @bucket="my-syslog-bucket", @connection=Gcloud::Storage::Connection(---), @owners=nil, @writers=nil, @readers=nil>
irb(main):007:0> sink = logging.create_sink "my-sink", "storage.googleapis.com/#{bucket.id}", filter: "log:syslog"
Gcloud::PermissionDeniedError: 7:Cloud Logging needs owner permissions on the bucket: my-syslog-bucket
    from /Users/quartzmo/code/google/codez/gcloud-ruby/lib/gcloud/logging/project.rb:480:in `rescue in create_sink'
    from /Users/quartzmo/code/google/codez/gcloud-ruby/lib/gcloud/logging/project.rb:475:in `create_sink'