tracepoints: remove the hello world provider

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
tracepoints: use compact form for actor tracepoints

Link: https://github.com/GeneAssembly/biosal/issues/764
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
tracepoints: use compact syntax to define tracepoints

Link: http://lists.lttng.org/pipermail/lttng-dev/2014-October/023607.html
Link: https://github.com/GeneAssembly/biosal/issues/764
Suggested-by: Daniel Thibault <Daniel.Thibault@drdc-rddc.gc.ca>
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>