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8e26a1fff1
Check the client count before creating the ephemeral key, do not
create the key if there are already too many clients. Check the
count after creating the key again, if the total kvs is bigger
than the expected count, then check the rev of the current key,
and take action accordingly based on its rev. If its rev is in
the first ${count}, then it's valid client, otherwise, it should
fail.
Signed-off-by: Benjamin Wang <wachao@vmware.com>