Reset cfgupgrade --downgrade to be a no-op
Reset cfgupgrade --downgrade to be a no-op

In version 2.10 cfgupgrade --downgrade is supposed to downgrade
the configuration to version 2.9 which, at the moment, is still
the same as 2.10.

Signed-off-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>
Reviewed-by: Michele Tartara <05f7077a2c6cbbdc4af4ba42e3ef89a0df846179@google.com>

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