bw-limit: Pass int parameters to Open vSwitch
bw-limit: Pass int parameters to Open vSwitch

Make sure we pass integer values to ovs when configuring bandwidth
limit. This was likely working properly with Python2, and we may have
missed this when migrating to Python3:

https://www.python.org/dev/peps/pep-0238/

Change-Id: I2f8d974d6644657aea95302d94ca0095d70a7e62
Closes-Bug: #1936839
Co-Authored-By: Tamás Trásy <aa572e8d68a9b51d67d42871a407e732f722700c@ericsson.com>

mahak/neutron,openstack/neutron,mahak/neutron,openstack/neutron,mahak/neutron,openstack/neutron