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When an stp is enabled on an existing bridge mstpctl attributes are not always configured by ifreload. This is due to a timing issue (cache) and some issue in the mstpctl addon. - Cache: when changing an existing bridge (done via netlink) we wait for the kernel ack but we don't update our current cache with the new bridge attributes This is bad because it means that the bridge cache data are stale until we receive the notification from the kernel. - Mstp addon: mstpctl-stp was deprecated in favor of bridge-stp, but in some place, the mstpctl.py code checks for mstpctl-stp but not for bridge-stp. This commit fixes the area related to this issue but this should be revisited in a later commit Ticket: CM-28951 Reviewed By: Roopa Testing Done: precommit, smoke, evpn-smoke Signed-off-by: Julien Fortin <julien@cumulusnetworks.com>