oak-segment-remote: PersistentRedisCacheTest may fail on Windows due to insufficient pagefile size

The PersistentRedisCacheTest tries to start a Redis server from the commandline without specific options. The server will then try to allocate 3G shared memory from Windows, which may apparently fail even if the pagefile is just too fragmented (that happened to me, after a Windows reboot it worked again).

I suggest using the commandline option "maxmemory 768mb" to avoid this. 768mb seem to be sufficient to run the test.