[PATCH] Remove size limit of client-side parsing of dirsync control

[Garming Sam]

Hi metze,

In a domain with 200 cursor entries in the dirsync cookie, while I was
looking at syncing passwords, I noticed that the server failed to get a
valid cookie returned and it turned out that it was truncated by the
client (at 1024 base64 characters or ~670 bytes). Attached is the patch
where I just did the simplest thing to get it to work. I don't know if
we should have further validation, but I didn't know if there were
actual limitations to this cookie, or what's done in Windows either.

Cheers,

Garming

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