Fix entrypoint of OneConvergencePlugin plugin
Fix entrypoint of OneConvergencePlugin plugin

In setup.cfg entrypoint of OneConvergencePlugin is set incorrectly.
Used '.' instead of ':'.

Closes-bug: #1372810

Change-Id: Ic1e154cfcf8b13f021b0635238e07a0459a25a9e

gkotton/vmware-nsx,gkotton/vmware-nsx