VOL-2395:  Old etcd cache remembers valuesit should not

This causes any outside updates to KV to be missed.
Eliminate the cache.

Also bump protos to match what openonu already uses.
This prevents a "make venv" error, nothing functional is
affected as onu already uses these protos.

Change-Id: Ie7e1e8059de28e540dfeb97228c346cfed7171f8
diff --git a/requirements.txt b/requirements.txt
index d29f34d..c9d8f03 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,4 +18,4 @@
 structlog==19.2.0
 transitions==0.6.4
 txaioetcd==0.3.0
-voltha-protos==2.1.1
+voltha-protos==2.1.2