Porting to switch-softwaretype involves:
 - use recipe slapos.cookbook:switch-softwaretype instead of slapos.cookbook:softwaretype
 - don't render software type profiles, only use cloudooo-dynamic-template:rendered
  instead of ${cloudooo-dynamic-template:rendered}, the profile will be rendered
  later.
 - have a RootSoftwareInstance default alias
 - have a part reading parameters using slapos.cookbook:slapconfiguration
  named slap-configuration. This is what slapos.cookbook:switch-softwaretype
  expects. Here we renamed the existing part.

At the same time, remove slap-connection that was added as backward compatibility,
slapos.core supports this since commit 0fbed0d1 (Migrate slap_connection to
 slap-connection, and use variables names separated with '-'., 2012-09-18) that
was part of release 0.29