reduce logging of hubot

[maxandersen]

When I have a pipeline without any hubot configured I still see:

[Pipeline] hubotApprove
Hubot sending to room fabric8_default => Would you like to promote version 2.0.1 to the next environment?

    to Proceed reply:  fabric8 jenkins proceed job maxandersen/mirror/master build 1
    to Abort reply:    fabric8 jenkins abort job maxandersen/mirror/master build 1

No service hubot  is running!!!
No service found!

Two things come to mind:

1. why does it even tell me about hubot when I don't have it running. I assume for many this would be the default and thus 9 lines of output is wasteful. If it must do something maybe only do 1 line like Service hubot is not running!

2. shouldn't enable/disablement of features in the shared jenkins pipeline be something controlled by the user ? i.e. by the user enable/disabling extensions rather than it is defined in the world global: github.com/fabric8io/fabric8-pipeline-library@master ?