Until now, if json item files couldn't be read, the script was
crashing. This commit delete the corrupted files as they do not
provide any useful information.

monitor_config_write: CORS apache conf should be rendered from a slapos template instead of being hardcoded

Revert "resiliencytest: adds tests on services status after takover for the slaprunner" and its fixup!

This reverts commit 26c5ef0b.
This reverts commit edc91312.

resiliencytestsuite: sleeping should happen before doing takeover, otherwise clone instances may not be ready

resiliencytest: test suite for slaprunner now uses a special SR for test, lighter than the previous helloworld SR