LMS-1365 setSessionUser() with tests implemented. Missing: white list of hosts

.../openbis/plugin/phosphonetx/server/PhosphoNetXServer.java

...is/plugin/phosphonetx/server/PhosphoNetXServerLogger.java

...isd/openbis/plugin/phosphonetx/server/RawDataService.java

...bis/plugin/phosphonetx/server/RawDataServiceInternal.java

...ugin/phosphonetx/server/RawDataServiceInternalLogger.java

...enbis/plugin/phosphonetx/server/RawDataServiceLogger.java

...cisd/openbis/plugin/screening/server/ScreeningServer.java

...penbis/plugin/screening/server/ScreeningServerLogger.java