Fix return code for o365_mu service
requested to merge github/fork/stavamichal/returnCodeInO365MuIsSharedBetweenThreadsAndNeedToBeDeclareAsShared into master
Created by: stavamichal
- there is variable "returnCode" which need to be delcared as shared, because it need to be shared between all threads to set correct return code
- small change of processing return code in gen script o365_mu was done, it is more cosmetic change