* Add option to start autocluster. This is useful for scenarios where
a cluster is already running and has some configurations set (via
config handler/cluster rpc) and later another node joins.
* Improve mnesia data directory isolation for nodes. A new dir is set
so that we may avoid intra and inter-suite flakiness due to dirty
tables and schema.
* The janitor is now called synchronously. This ensures the cleanup
is done before the test pid dies.
Due to:
* Cluster RPC MFA is not idempotent!
* There is a lack of rollback for callback's side-effects
For instance, when two nodes try to add a cluster-singleton
concurrently, one of them will have to wait for the table lock
then try to catch-up, then try to apply MFA.
The catch-up will have the singleton created, but the initiated
initiated multicall apply will fail causing the commit to rollback,
but not to 'undo' the singleton creation.
Later, the retries will fail indefinitely.
Thales Macedo Garitezi