Added ExecStartPre entries to service section to ensure data and log directories exist
Added ExecStartPre entries to service section to ensure data and log directories exist

tleyden/sync_gateway,couchbaselabs/sync_gateway,tleyden/sync_gateway,ceejatec/sync_gateway,evankyle/sync_gateway,tleyden/sync_gateway,tophatch/sync_gateway,tleyden/sync_gateway,couchbaselabs/sync_gateway,evankyle/sync_gateway,tophatch/sync_gateway,paulharter/sync_gateway,paulharter/sync_gateway,paulharter/sync_gateway,ceejatec/sync_gateway,tophatch/sync_gateway,ceejatec/sync_gateway,paulharter/sync_gateway,evankyle/sync_gateway,couchbaselabs/sync_gateway,tophatch/sync_gateway,ceejatec/sync_gateway,couchbaselabs/sync_gateway,evankyle/sync_gateway