Rename efLogServerSideEvent -> efLogEvent; deprecate former

The interface that EventLogging presents should be uniform and elegant;
'efLogServerSideEvent' is neither. So rename it to 'efLogEvent', but provide an
alias for backward-compatibility.

Since this is an API change, bump EventLogging's version from 0.7 to 0.8.

Change-Id: Ifa74cbd557b26f629eaf62bbd56e2fc2a8ded410