BUG-8309: Add message identity information

BUG-8309: Add message identity information

We have encountered an attempt to serialize a local request across
a remote connection. Since this is hit by the akka serializer, we
have lost the identity of the call site and of the message, because
all akka is seeing is the Envelope and the exception's stack trace,
which only indicates class hierarchy up to and including
AbstractLocalTransactionRequest.

This patch enriches the exception message so we know what the actual
request was, hopefully pinpointing the offending call site. Since
the problem revolves around the reconnect process, bump critical
transitions to info instead of debug.

Change-Id: I6d6d6e702d4b5baff7b707242583e923708e7637
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>