When deploying with `new-units-paused`='true' OpenStack upgrade step should be skipped

[Frode Nordahl]

On initial charm deploy one of the steps the charm does is upgrading all packages.

This step should be skipped when deployed with `new-units-paused`='true'.

$ juju config ovn-dedicated-chassis new-units-paused
true
$ juju status ovn-dedicated-chassis
Model Controller Cloud/Region Version SLA Timestamp
serverstack9 serverstack-controller churel-maas 2.8.10 unsupported 08:41:22Z

App Version Status Scale Charm Store Rev OS Notes
ganglia-node 3.6.0 active 0 ganglia-node jujucharms 8 ubuntu
neutron-gateway active 0 neutron-gateway jujucharms 297 ubuntu
nrpe active 0 nrpe jujucharms 73 ubuntu
ntp 3.5 active 0 ntp jujucharms 46 ubuntu
ovn-dedicated-chassis maintenance 1 ovn-dedicated-chassis jujucharms 17 ubuntu

Unit Workload Agent Machine Public address Ports Message
ovn-dedicated-chassis/0* maintenance executing 1 10.245.160.3 (install) Running openstack upgrade

Machine State DNS Inst id Series AZ Message
1 started 10.245.160.3 8esnbp focal default Deployed