Merge pull request #9 from safchain/service_instance

Service instance
Merge pull request #10 from safchain/service_instance

Service instance
Fix dependency manager test
Fix coding style
Signed-off-by: Sylvain Afchain <sylvain.afchain@enovance.com>

Change-Id: Ib715a791c96092a30e3957b1d761800b94f672c4