restart: use /tmp for restart tests.
restart: use /tmp for restart tests.

Was using /dev/shm during development because it was convenient; but
it's not the right place to use for any production case, and thus
neither for testing.

Filesystem is fine for these short/small tests.

memcached/memcached,memcached/memcached,dormando/memcached,memcached/memcached,dormando/memcached,dormando/memcached,memcached/memcached,memcached/memcached,dormando/memcached,dormando/memcached