obsdiscovery: adopt to calling convention change Upstream commits 71d83b315778 and abce899c985f changed the calling convention of setdiscovery._takefullsample(). We inspect the signature of the function before calling it so we can pass the proper arguments.

# name space package to host third party extensions
from __future__ import absolute_import
import pkgutil
__path__ = pkgutil.extend_path(__path__, __name__)