Ensure basic logging config is applied

Fixes bug 1252775

Previously the CLI emitted an obscure message related to
logging config when a API call failure was encountered
without the --debug flag being set:

  No handlers could be found for logger "ceilometerclient.common.http"

Now we always set the basic logging config with serverity
level of warning at least, so as to give the user a more
friendly and less confusing error message.

Change-Id: I5c6e70e97defca49ca62346f90190935646ff383
Merge "Ensure basic logging config is applied"