*schedulerWorkflow.BindPluginContentType() returns an error that's never checked

[geauxvirtual]

In scheduler/scheduler.go line 189, *schedulerWorkflow.BindPluginContentType() is called, but the err variable set in this call is never checked.

https://github.com/intelsdi-x/snap/blob/master/scheduler/scheduler.go#L189

In scheduler/workflow.go, *schedulerWorkflow.BindPluginContentType() calls an internal method bindPluginContentType(), but then directly returns nil instead of any error from bindPluginContentType().

https://github.com/intelsdi-x/snap/blob/master/scheduler/workflow.go#L233-L236

In bindPluginContentType(), when a publisher is included with a process node, bindPluginContentType() is called for the publish nodes (and any other process nodes), but any error from this call is never caught and returned.

https://github.com/intelsdi-x/snap/blob/master/scheduler/workflow.go#L274