Update to jemalloc 2.2.5

clean REDIS_DIRTY_CAS when discard Command runs. otherwise the next MULT...

clean REDIS_DIRTY_CAS when discard Command runs. otherwise the next MULTI/EXEC may fail in the same RedisClient 

minor refactoring to networking.c adding a separated function to get a string representing the current state of all the connected clients.

new counter in INFO output: rejected_connections with number of dropped connections because of maxclients limit reached.

Fixed a typo in comments.

Fixed command table for SETEX and PSETEX causing the expire time to be hashed by Redis cluster instead of the key.

code generating the CLIENT LIST output refactored to have a function that is able to render a single client into a client info string.

Fix some minor typos.

New script timeout semantics and SCRIPT KILL implemented. SHUTDOWN NOSAVE and SHUTDOWN SAVE implemented.

Fix crash on SPARC due to improper alignment of allocated memory

I believe that you should be able to drop 'defined(__sun)' completely
from this clause, as Solaris on x86 hardware probably does not have
strict alignment requirements, but I don't have a way to test that.

Thanks to Jurij Smakov <jurij@wooyd.org>.
Signed-off-by: NChris Lamb <lamby@debian.org>