Do not log when reraising an exception
Do not log when reraising an exception

It should be up to the caller to use the log level error
when the exception is reraised. For example, if the call
to a VIM api fails, _poll_task is currently throwing a big
red block even if the caller ignores the exception.

This patch removes the logging from _poll_task.

Change-Id: I5bceb41c9a24dca45ff8689daee0eeafa7da839c

openstack/oslo.vmware