This allows the path for the default filter to be specified explicitly
when creating a stream and reduces the need to rely on the default path
function to magically supply the path.
The default path function is now only used if, when a filter is added to
a stream, it has neither a path nor a path function already.
Adapted the existing Log::create_stream calls to explicitly specify a
path value.
Addresses BIT-1324
* origin/topic/vladg/radius:
Radius functionality and memleak test.
Update test baselines.
Move seq to uint64 to match recent changes in seq processing.
BIT-1129 #merged
