lttng: update modules, tools and ust to latest stable-2.4

JIRA: SB-3038

The latest tracepoint fix in kernel has brought up the underlying
issue of the lttng-modules, patch that fixes the issue:

http://git.lttng.org/?p=lttng-modules.git;a=commit;h=bba0442a9e5b4460fdfc5bb3ed95f323e52c0909

This patch depends on other bugfix patches from v2.4.0 to v2.4.1, so
update to latest stable-2.4 revision in-order to get uniform and stable
functionality of LTTng.

Signed-off-by: Srikanth Krishnakar <Srikanth_Krishnakar@mentor.com>
Merge pull request #18 from skrishnakar/lttng-update-stable

Lttng update to stable-2.4