[BUG] Node frontend unresponsive after opt-in request

[erdzan12]

When requesting the first time to opt-in to the reputation system of las2peer or the re-request the faucet payout, the whole website is not accessible until the payout is completed . This probably comes down that, when the payout process is processing and another user wants to access the node frontend some reputation system implementations are used and thus called, which can not run until the payout process is finished. The webconnector does not seem to be the bottleneck as it can use multiple threads. https://github.com/rwth-acis/las2peer/blob/master/webconnector/src/main/java/i5/las2peer/connectors/webConnector/WebConnector.java#L126