TMF: Add an API to query analyses to obtain their requirements

Change-Id: I764291e0ca5281550a16d61a9aa8dbf5ca05d390
Signed-off-by: Mathieu Rail <contact@mathieurail.com>
Signed-off-by: Guilliano Molaire <guilliamo-jaime.molaire@polymtl.ca>
TMF: Add an interface for strings regarding a session configuration

Creation of the lttng2.core.session package with the strings that will be used
for session configuration generation. We also externalized the bundle for the
kernel and ust plugin.

Change-Id: If51a4805064ed701a2bbf31a7f327406410f71a6
Signed-off-by: Guilliano Molaire <guilliamo-jaime.molaire@polymtl.ca>