It is needed for new version of slapos.libnetworkcache.

Also allow to bypass default value.

Reverts part of be3b061c

Completely rewrite the wrappers generation so that one is able to understand it...
... without spending hours.

hashing with SHA512 is only intellectual masturbation.

Resilient stack: define different ssh/httpd ports from pbs, import and export. Allow to have import/export using same IP.

fixed long ago.

Does not fail when requested instance is not ready.
Factor code with instance-guid.

This reverts commit 32e8dfb1.