Avoid using instance disk template in cmdlib.instance
Avoid using instance disk template in cmdlib.instance

Remove dependency on instance disk_template and replace it with disk
type in the package cmdlib.instance.

Signed-off-by: Aaron Karper <99cc1031546340b2b8ced5fe338b5890677a56ca@google.com>
Signed-off-by: Michele Tartara <05f7077a2c6cbbdc4af4ba42e3ef89a0df846179@google.com>
Reviewed-by: Michele Tartara <05f7077a2c6cbbdc4af4ba42e3ef89a0df846179@google.com>

yiannist/ganeti,ganeti/ganeti,ganeti/ganeti,dimara/ganeti,andir/ganeti,grnet/snf-ganeti,mbakke/ganeti,yiannist/ganeti,leshchevds/ganeti,bitemyapp/ganeti,apyrgio/ganeti,onponomarev/ganeti,onponomarev/ganeti,yiannist/ganeti,dimara/ganeti,leshchevds/ganeti,andir/ganeti,mbakke/ganeti,ganeti-github-testing/ganeti-test-1,ganeti-github-testing/ganeti-test-1,mbakke/ganeti,bitemyapp/ganeti,ganeti/ganeti,andir/ganeti,leshchevds/ganeti,grnet/snf-ganeti,apyrgio/ganeti