Allow exceptions to pass over RPC silently

When one service performs an operation on behalf of another, the
act of passing back an exception (even a known one) causes a lot
of scary log messages about the (presumed to be) error case. This
patch adds a client_exceptions decorator common/rpc/common.py,
which allows RPC services to declare the list of expected exceptions
for each method. If such an exception is raised during the RPC
dispatch, it is wrapped in a ClientException so that the RPC layer
can gracefully pass it back without overly-verbose logging.

This will allow us to fix nova bug 1084707

Change-Id: I4e7b19dc730342091fd70a717065741d56da4555

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