These are leftover from opendev migration and
without this fix the links results into Not Found.
Mainly need to use "src" in place of "tree" to
get these links working with opendev.org.
Also used git tags where line references are used
as branched references do not persist. And for line
references use #L in place of #n as that's where it
get's redirected.
Also update references for zuul and use of
devstack-vm-gate-wrap.sh in neutron functional jobs.
Change-Id: I92d11c99a17dab80d4b91da49f341f9ba202bcfe
yatinkarel
4e395c5d2b