Make it possible to disable weaveplugin poll

[carlpett]

We use weave-proxy, and thus get an error log when Scope does polling for the weaveplugin container here every 10 seconds.

I would like to either be able to disable this with a flag.

[2opremio]

@carlpett It's already possible, just start scope with --weave=false

[rade]

but that turns off all weave net reporting. The OP does run weave net, just not the plugin.

[2opremio]

Then there isn't a way, thanks for the clarification.

[rade]

This was fixed in #2719.