change doc aodh bug tracker url
change doc aodh bug tracker url

Change-Id: I1e9e79f4c7dc5e12e6a001b60b6654f536408d47
Signed-off-by: Yuanbin.Chen <115798e15ddd872778e240322a1a46f7d51b5ce2@gmail.com>

openstack/aodh,openstack/aodh