[service] changed default mount_type for customservices from union to None
[service] changed default mount_type for customservices from union to None

* now all default mount_types should correctly be set to None (instead of union)

Signed-off-by: Robert Wuttke <12e9293ec6b30c7fa8a0926af42807e929c1684f@benocs.com>

Benocs/core,Benocs/core,Benocs/core,Benocs/core,Benocs/core