Fix race condition in rocky8 multi node MTR.

Sometimes mtr stage (multi node stage using docker images) for rocky 8 failed in CI.

The issue is in combination of code in drone.jsonnet file (engine repo) and in provision file (docker repo).

In multi_mtr step (drone.jsonnet) we invoking docker compose up -d right before invoking provision command on mcs1 node. At the same time, while "provisioning" we never checked if cmapi finished starting or not.
So mcs cluster set-apikey command invoked before CMAPI finished its initialization.