TTL / PTTL commands: two bugs fixed.
This commit fixes two corner cases for the TTL command. 1) When the key was already logically expired (expire time older than current time) the command returned -1 instead of -2. 2) When the key was existing and the expire was found to be exactly 0 (the key was just about to expire), the command reported -1 (that is, no expire) instead of a TTL of zero (that is, about to expire).
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