reduce maxCSSZ to avoid readv EINVAL error #1749
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if the reported value goes above 2093056, clients crash due to readv having iovcnt > 1024
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if the reported value goes above 2093056, clients crash due to readv having iovcnt > 1024.
The original value of 1022 * page size of 4096 generated dlen of 4186112. These were then resolved client side in XrdCl/XrdClAsyncPageReader.hh to ::readv calls of iovcnt 2044, triggering the einval error.
fix for #1740