Ability to set global (volume) options

[sammcj]

Global volume options for the cluster are set using the volume parameter of 'all'.

For example, to enable multiplexing:

gluster volume set all cluster.brick-multiplex on

However, this module does not seem to have any way to set options on the volume 'all', as it requires brick paths etc... and thus results in the following error:

 Error 500 on SERVER: Server Error: Evaluation Error: Error while evaluating a Resource Statement, Gluster::Volume[all]: expects a value for parameter 'bricks'