Revert "[Fullstack] Mark test_bw_limit_qos_port_removed as unstable"
Revert "[Fullstack] Mark test_bw_limit_qos_port_removed as unstable"

This reverts commit 7f7d65ea4c58b665c2b54fa9f2e8ec1f81668b48.

Now bug 1737892 is closed with patch
I3cf5c57c7f232deaa190ab6b0129e398fdabe592
so it should be safe to remove mark of this test as unstable.

Change-Id: Ie3f16dc113455062a9f404de045412d4097b3f8b
Related-Bug: #1737892

huntxu/neutron,huntxu/neutron,openstack/neutron,noironetworks/neutron,mahak/neutron,noironetworks/neutron,mahak/neutron,openstack/neutron,openstack/neutron,mahak/neutron