Proposed change to mountd: allow quoted group/user names

[Sean Fagan]

https://reviews.freebsd.org/D4201

Hopefully I did this correctly.

In a nutshell, we’ve run into cases where a directory server (*cough* windows *cough*) will have group names with spaces in them.  This causes sadness to happen.  And mountd doesn’t allow them to be quoted.  This proposed diff allows the quoting.

(N.B.  I did not yet extend it to pathnames.  That could be done, but it’s not generally as necessary.)

Thanks,

Sean.