Add debian_pkg_dirs file to stx/monitoring.
This way, packages will be picked up by the build system.
Test Plan:
PASS: pkgs picked up by build system
Story: 2009101
Task: 43962
Signed-off-by: Leonardo Fagundes Luz Serrano <Leonardo.FagundesLuzSerrano@windriver.com>
Change-Id: Ia6a5e88fd8eb4682ae9ff91a77bf5f7da2c0dc10