Try to get rid of the "events" & "raw events" naming in the code.

Rather use the term "samples" as having both is confusing.
Note: this does *not* change the API, just the terminology in the code.

bug 1104492
Signed-off-by: Angus Salkeld <asalkeld@redhat.com>
Change-Id: If8cf89db60b52815db8e0acbf466400d0e9238c6
Merge "Try to get rid of the "events" & "raw events" naming in the code."