xtrace less

we are xtrace happy, however that's just generating bulk in log
files that are mostly ignorable. For the basically bullet proof
functions we should not xtrace.

Change-Id: Iab4e6d270c1546e0db2a06395cefcdf7f7929c3c
Merge "xtrace less"
Merge branch 'master' of github.com:openstack-dev/devstack