Better Create failure msgs about link HOT 3 OPEN

from link.

@aplteam The issue is that "Destination directory not empty" is misleading when trying to re-establish the connection between a namespace and a directory, but differences have crept in. (If everything matches, Link will happily establish a connection, though both sides have contents.) Do you have a suggestion for a better general message? (Link cannot distinguish between the case where you're trying to link to an already used directory, and the case where there's a discrepancy in an otherwise sync'ed ns–dir pair.)

from link.

from link.