A DBUS API to move the files between containers

A DBUS API to move the files between containers

[Bug/Feature]   Add an ability for a container to request a file move to another container.
                Some minor fixes here and there.
                Added missing tests for utils/fs.
                A little revamp of DbusAccessory in ut-cm tests.
[Cause]         N/A
[Solution]      Implement a DBUS API and a simple move implementation.
[Verification]  Build, install, run tests, run server.

Change-Id: I881f7b6079e38e3dd43d6fe34360457172047c2c
Signed-off-by: Lukasz Pawelczyk <l.pawelczyk@partner.samsung.com>