Input monitor

Input monitor

[Feature]       Monitoring of events on input device files.
[Cause]         There is no possibility to use *home button* in
                native apps (there is no API for that).
[Solution]      *Input monitor* class is added. It allows to
                watch events on given device (not only *home button*).
                When a pattern given in .conf file is recognized,
                appropriate action is taken (i.e. callback).
[Verification]  Compiled, built and run.

Conflicts:
        common/utils/fs.cpp
        common/utils/fs.hpp
        server/containers-manager.hpp

Change-Id: I7bddd917e6da8d70c26c4188a640638669430619
Signed-off-by: Pawel Broda <p.broda@partner.samsung.com>
Signed-off-by: Jan Olszak <j.olszak@samsung.com>