Log all IO communication with optical HW

This might get *very* verbose for Lumentum OCMs, so let's see how well
it fares in practice.

On the other hand, it was very useful in identifying why the heck the
EDFA module in the Coherent A/D sent us garbage.

Change-Id: I4d0dcb18401e5daeaaa6e6b708fe11c8fd0f0512
diff --git a/package/cla-sysrepo/cla-appliance.service.in b/package/cla-sysrepo/cla-appliance.service.in
index fb7b29a..061c9d2 100644
--- a/package/cla-sysrepo/cla-appliance.service.in
+++ b/package/cla-sysrepo/cla-appliance.service.in
@@ -9,7 +9,7 @@
 
 [Service]
 Type=simple
-ExecStart=/usr/bin/cla-sysrepod --properties-log-level=5 --sr-bridge-log-level=5 --sysrepo-log-level=3 --appliance=__MODEL__-clearfog
+ExecStart=/usr/bin/cla-sysrepod --io-log-level=4 --properties-log-level=5 --sr-bridge-log-level=5 --sysrepo-log-level=3 --appliance=__MODEL__-clearfog
 PrivateTmp=yes
 PrivateDevices=no
 ProtectSystem=yes