Fix pep8 violations in peer/base.py
Fix pep8 violations in peer/base.py

Change-Id: I34842eef64bd33dcf84aa97ddfe79e86474abc86
Signed-off-by: Thanh Ha <09ea4d3a79c8bee41a16519f6a431f6bc0fd8d6f@linuxfoundation.org>

inocybe/odl-bgpcep,inocybe/odl-bgpcep,bigdataops/bgpcep,bigdataops/bgpcep,opendaylight/bgpcep