Remove call to addCleanup(cfg.CONF.reset)
Remove call to addCleanup(cfg.CONF.reset)

The addCleanup(cfg.CONF.reset) is done by base class,
therefore no need to invoke it from mlnx agent unit test setUp method.

Change-Id: Ie7e55d92e63a28699d8fec7c63951449eb7c0a50
Closes-Bug: 1286716

openstack/networking-mlnx,stackforge/networking-mlnx,stackforge/networking-mlnx,moshele/networking-mlnx-master,openstack/networking-mlnx,moshele/networking-mlnx