…edis_clone_develop

Presently PhpRedis will segfault if users attempt to clone either the
Redis or RedisCluster objects.

We plan on investigating proper clone support in future releases, but
for now just diable the handlers.

Without this, performing a HMGET call fails to decompress the data before
returning it to php.

ZSTD uses two defined error numbers to inform the caller when the
compressed data is invalid (e.g. wrong magic number) or the size is
unknown.

We should always know the size so abort if ZSTD returns either to us.

Fixes: phpredis#1936

)

Rework the session locking unit tests to be less reliant on arbitrary
sleep calls which can be very troublesome when running in Travis and
especially when running in Travis under valgrind.

…ne_develop

…elop_simple_strings