I "solved" it by creating symlinks
ln -s /home/wal/dsr-mn2/desire.conf /home/vvn/.desirecore
Of course, this won't work with multiple MN as it seems in your case
I suspect, however, this is only related to tests. Even symlinking won't make the tests pass, because all hashes/roots/etc. on the tests are dash ones, not desire, thus failing pretty much everything.
Thanks for your answer!
For signle MN we can use directory symlink as a workaround. I.e. in my case:
ln -s /home/wal/dsr-mn2 /home/vvn/.desirecore
If anyone want to replay it: you must delete '.desirecore' directory first! Be carefull: it may contain usefull data!
Another one problem: during MN installation I removed all RPC credential from conf (to increase sequrity). But Sentinel requires RPC access and I was forced to add 'rpcuser' and 'rpcpassword' to my conf-file
