Remove forthcoming instances on downgrade
Remove forthcoming instances on downgrade

Forthcoming instances were newly introduced in Ganeti 2.14, hence
remove them on downgrade. Note that nothing has to be changed in
the physical world, as forthcoming instances are not created yet.

Signed-off-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>
Reviewed-by: Niklas Hambuechen <98215d3a72cb13cc9c9956528e50119ca7d1fb8b@google.com>

mbakke/ganeti,andir/ganeti,andir/ganeti,grnet/snf-ganeti,onponomarev/ganeti,leshchevds/ganeti,ganeti/ganeti,ganeti/ganeti,andir/ganeti,yiannist/ganeti,dimara/ganeti,onponomarev/ganeti,bitemyapp/ganeti,leshchevds/ganeti,mbakke/ganeti,mbakke/ganeti,yiannist/ganeti,grnet/snf-ganeti,leshchevds/ganeti,bitemyapp/ganeti,yiannist/ganeti,apyrgio/ganeti,dimara/ganeti,ganeti/ganeti,apyrgio/ganeti