Fix CONFIG_SCHEMA for runners

We have strict format requests for user input task configuration file.
And, we use CONFIG_SCHEMA to check the formate.
While the CONFIG_SCHEMA is not accurate, user tasks will not start.

Close-bug #1294969

Change-Id: Ib89d6a1e2dcbc951ea9fcd668f1cb503f81bc9cc
Merge "Fix CONFIG_SCHEMA for runners"