Restrict D-Bus access and disable autostart

[imobachgs]

As part of the security audit, we have been asked to limit the access to the D-Bus service to a specific user (we are starting with root) and to disable the autostart, as it does not make sense in case of the installer.

[coveralls]

Pull Request Test Coverage Report for Build 3273855352

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+1.6%) to 78.017%

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Totals
Change from base Build 3271281546:	1.6%
Covered Lines:	592
Relevant Lines:	732

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💛 - Coveralls