tmf : Make waitForInitialization() return a boolean

tmf : Make waitForInitialization() return a boolean

waitForInitialization() should return a boolean that will indicate
wether the initialization went well or not. If true, there should be
state systems available.

Change-Id: Id9d053322ff86c93dedb8c0897924fa31720ebfe
Signed-off-by: Jean-Christian Kouame <jean-christian.kouame@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/67285
Reviewed-by: Genevieve Bastien <gbastien+lttng@versatic.net>
Tested-by: Genevieve Bastien <gbastien+lttng@versatic.net>
Reviewed-by: Hudson CI
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>