* When using redis as the backend of osprofiler, it cannot connect to
redis because the redis_connection_string is incorrect.
* Let other places that use redis also use this variable.
Change-Id: I14de6597932d05cd7f804a35c6764ba4ae9087cd
Closes-Bug: #1833200
Signed-off-by: ZijianGuo <guozijn@gmail.com>
(cherry picked from commit cd836dd39f00c9a265571fc2745d9642ca72cd77)