Wipe operational state

Clustered data store may end up persisting our data, which means that if
an instance comes up after a crash, we may have stale data. Rather than
failing to come up, lets just wipe whatever was there.

Change-Id: I3b43d9bf692f083142e44fe8b588d1a92f81e7a2
Signed-off-by: Robert Varga <rovarga@cisco.com>