Until now, standalone was running slapos node software/instance with --all flag
which force installing software or processing software, unlike "normal" slapos
node which no longer install on software once they are completed and only process
instances when they are requested with different parameters or when they have
failing promises.

We stop using the --all flag, to behave like a normal slapos node.

This reveal missing promises in some softwares, after this change, waitForInstance
can return faster. This reveal test failures with some softwares where the
instanciation step request other instances, but without having a promise to wait
for their requests to have been sucessfully processed; in this case waitForInstance
return too early.

We keep an "install_all" API to force reinstalling software, this can be useful
for scenarios like erp5testnode, or software release development.