Component execution polling: don't break on cancelling (#3638)
Component execution polling: don't break on cancelling (#3638)

We want to "return true" if the component execution is cancelled,
and we're cancelled as well. But maybe we haven't been cancelled just
yet, maybe we're still cancelling.
cloudify-cosmo/cloudify-manager,cloudify-cosmo/cloudify-manager,cloudify-cosmo/cloudify-manager