This patch fixes a bug in the Related-Change that causes a prefix to
be added twice at the start of an 'exception' log message.
Previously, PrefixLoggerAdapter.exception would forward to the wrapped
LogAdapter.exception, and not call back to
PrefixLoggerAdapter.process. The prefix therefore needed to be added
in both PrefixLoggerAdapter.exception and PrefixLoggerAdapter.process
(for other log level methods).
SwiftLogAdapter.exception *does* call back to SwiftLogAdapter.process,
and so since the Related-Change it is not necessary to add the prefix
in both the SwiftLogAdapter.exception and SwiftLogAdapter.process
methods.
Related-Change: I8988c0add6bb4a65cc8be38f0bf527f141aac48a
Change-Id: Ia6e1f007989b0ef455b8dca8155b386a3fd9e8e1
ffbf17e47c