Remove the static directory path ReactOS in source code

I found a few static paths to "C:\ReactOS" in source code. Maybe that's the plan. I didn't delve into what the code does, but using a "hard" way, like "C:\ReactOS", instead of calling API functions to determine it - a potential bug.

/blob/master/base/services/nfsd/idmap.c:

static const char CONFIG_FILENAME[] = "C:\\ReactOS\\System32\\drivers\\etc
ms-nfs41-idmap.conf";

/blob/master/base/services/nfsd/nfs41_daemon.c:

static const char FILE_NETCONFIG[] = "C:\\ReactOS\\System32\\drivers\\etc
netconfig";

/blob/master/base/services/telnetd/telnetd.c:

const char *name = "c:\\reactos\\system32
cmd.exe";

In all these cases, it seems there will be problems if ReactOS is installed in a different folder than "C:\ReactOS".

P.S. Perhaps there are other places in the source code with "hard" paths. It would also be nice to run rostests on a system installed in a "random" folder.

P.P.S. Service "NFSv4.1 Client" does not start, if ReactOS is not installed in "C:\ReactOS"