[Swan-dev] make kvm... is a changing

[Andrew Cagney]

Remember, there's a 'base' base domain shared between build trees, and
'local' domains dedicated to a build tree.  If KVM_PREFIXES is used,
multiple local domains are possible.

The following changes are in place:

- the base domain (swanfedorabase, swanfedora22base, swanfedora26base) is
only required when first creating the local domains

  i.e., once the local domain suite is created, 'base' can safely be
deleted using 'make kvm-uninstall-base-domain'
  if ever it doesn't exist and is needed, it will be created again

- make kvm-upgrade aka make kvm-upgrade-local-domains

  this is now the 'official' way to upgrade an existing suite of local
domains.  It deals with details like rebuilding the test domains.
  It doesn't touch or require the 'base' domain (if you really really want
to upgrade the base domain use 'kvm-upgrade-base-domain')

- make kvm-install-hive (experimental)

  this first installs libreswan onto a dedicated local build domain, and
then clones the build domain creating the relevant test domains with
libreswan pre-installed
  if you have lots of test domains this is likely faster; this might become
the default

Once the above has settled, I'm also looking at:

- change the default 'base' domain to 'swanfedora22base' (currently it is
swanfedorabase)

  the next time a local domain suite is created this would be created two;
but not before
  this sets us up for the switch to fedora26 which will get the name
swanfedora26base

- add/use a dedicated 'build' domain for building

  currently builds are performed using 'east' (the choice was arbitrary);
and 'east' doesn't have internet connectivity; in contrast 'build' does so
it can do stuff like download huge test vector files
  the hive builds already use this

Andrew
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