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.

i.e, enable cache.