docs: @Nullable protected de.uniulm.omi.cloudiator.flexiant.client.domain.Server searchByIp(
          Set<de.uniulm.omi.cloudiator.flexiant.client.domain.Server> servers, String ip) {
          for (de.uniulm.omi.cloudiator.flexiant.client.domain.Server server : servers) {
              if (server.getPublicIpAddress() != null && server.getPublicIpAddress().equals(ip)) {
                  return server;
              }
              if (server.getPrivateIpAddress() != null && server.getPrivateIpAddress().equals(ip)) {
                  return server;
              }
          }
          return null;
      }