[FAB-6350] DeliverService CI failure: serve < register
[FAB-6350] DeliverService CI failure: serve < register

The orderer service mock in the deliver service package tries to
register a gRPC server after serve might be called.

This is forbidden in the latest gRPC version.

the error is:

17:39:38 unit-tests_1  | 2017-09-29 17:39:38.437 UTC [grpc] Fatalf -> CRIT 06a grpc: Server.RegisterService after Server.Serve for "orderer.AtomicBroadcast"
17:39:38 unit-tests_1  | FAIL	github.com/hyperledger/fabric/core/deliverservice	7.090s
17:39:38 unit-tests_1  | error: exit status 1
17:39:38 unit-tests_1  | panic: EOF

Change-Id: I04b2ccc25ba6978ad3848571030515f051f71622
Signed-off-by: yacovm <632344b5da9bd743456189af4db4b56472defb8c@il.ibm.com>

manish-sethi/fabric-sidedb,lukehuangch/fabric,binhn/fabric,ckeyer/fabric,lukehuangch/fabric,mqshen/fabric,binhn/fabric,mqshen/fabric,lukehuangch/fabric,manish-sethi/fabric-sidedb,muralisrini/fabric,manish-sethi/fabric-sidedb,manish-sethi/fabric-sidedb,xixuejia/fabric,lukehuangch/fabric,stemlending/fabric,stemlending/fabric,ckeyer/fabric,muralisrini/fabric,lukehuangch/fabric,lukehuangch/fabric,manish-sethi/fabric,xixuejia/fabric,ckeyer/fabric,hyperledger/fabric,mqshen/fabric,mqshen/fabric,manish-sethi/fabric-sidedb,binhn/fabric,ckeyer/fabric,xixuejia/fabric,ckeyer/fabric,lukehuangch/fabric,stemlending/fabric,hyperledger/fabric,mqshen/fabric,ckeyer/fabric,manish-sethi/fabric,jimthematrix/fabric,jimthematrix/fabric,stemlending/fabric,mqshen/fabric,manish-sethi/fabric-sidedb,mqshen/fabric,manish-sethi/fabric-sidedb,ckeyer/fabric,muralisrini/fabric