Revert "Redact keystone password from logs in arista_ml2".
Revert "Redact keystone password from logs in arista_ml2".

A shallow copy is not sufficient since the params dict is passed by reference.

This reverts commit 9039b8a46b047b61ce672422bcfc13550399838f.

Change-Id: I9688a6792c21c7398ef7cd8340fcc35ddcdbbd94

openstack/networking-arista,stackforge/networking-arista,openstack/networking-arista