Event parsing tests are broken by following commit:

  perf tool: Precise mode requires exclude_guest
  commit 1342798c
  Author: David Ahern <dsahern@gmail.com>
  Date:   Thu Sep 13 14:59:13 2012 -0600

which enables 'exclude_guest' modifier any time the 'precise'
modifier is detected.

Fixing related tests and adding special comment.
Reported-by: NArnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: NJiri Olsa <jolsa@redhat.com>
Tested-by: NDavid Ahern <dsahern@gmail.com>
Acked-by: NDavid Ahern <dsahern@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>