oscwrap: make a little quieter

A huge part of the logs is irrelevant bash aliases captured by the
openstack client timing wrapper from the run of "openstack complete",
which is only helpful on interactive systems where you'll interact
with the command line.  Call it directly to avoid capturing the logs.

While we're here, turn off tracing inside the oscwrap function, which
is called frequently.  It's not useful for debugging.

Change-Id: I1cb5399fe7ee6f0e547a9cfff70396aa2007632e
diff --git a/stack.sh b/stack.sh
index 3c31644..a197995 100755
--- a/stack.sh
+++ b/stack.sh
@@ -1475,7 +1475,10 @@
 # ===============
 
 # Prepare bash completion for OSC
-openstack complete | sudo tee /etc/bash_completion.d/osc.bash_completion > /dev/null
+# Note we use "command" to avoid the timing wrapper
+# which isn't relevant here and floods logs
+command openstack complete \
+    | sudo tee /etc/bash_completion.d/osc.bash_completion > /dev/null
 
 # If cinder is configured, set global_filter for PV devices
 if is_service_enabled cinder; then