lttng: Also initialize static state values

lttng: Also initialize static state values

Instead of just defining the integers statically, we can also define
the matching state value objects themselves. This can potentially
save a lot of object allocations during state system construction.

Some allocations will still be needed for state values that are only
known at run-time.

Change-Id: I3839c7685f64adf5bec1a41bd6dc342d24fdb529
Signed-off-by: Alexandre Montplaisir <alexmonthy@voxpopuli.im>
Reviewed-on: https://git.eclipse.org/r/13564
Tested-by: Hudson CI
Reviewed-by: Patrick Tasse <patrick.tasse@gmail.com>
IP-Clean: Patrick Tasse <patrick.tasse@gmail.com>