interfaces: use old dbus encoding

Due to backwards compatibility with old configurations, this is an easy
fix to bring back the old object paths.

Tests are provided to capture this behavior.

Chang

interfaces: use old dbus encoding

Due to backwards compatibility with old configurations, this is an easy
fix to bring back the old object paths.

Tests are provided to capture this behavior.

Change-Id: Ic89f2eb02bb908cf23b833b08fdca941bef2a07a
Signed-off-by: Alexander Hansen <alexander.hansen@9elements.com>

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