Fixes external server tests and change other references.

[roshkhatri]

Fixes external server tests and change other references.

[PingXie]

Thanks! Changes LGTM but I think @madolson should have a look and the final say.

[zuiderkwast]

LGTM but we'll have to change all occurrences of placeholderkv again once we have a name for the project. Depending on how long that takes, we could wait for that before merging this.

[madolson]

@zuiderkwast eh, there are some non-overlapping changes here as well (like the flags changes). We'll have to do a lot of scrubbing, doing a find and replace on placeholderkv is much faster than redis.