When setting --ssl and specifying unit count for a ha unit, the number of units defaults to 1

[Arif Ali]

When specifying --ssl, then the number of units specified by a specific ha overlay is overwritten due to the line 338 in 01configure script and also adds --ha to the options. This in turn adds the cinder-ha, glance-ha, keystone-ha, neutron-api-ha, nova-cloud-controller-ha with one unit each as well as defaulting to 1 for keystone-ha.

This was unexpected, as I only wanted to test ssl with keystone-ha

Here was my script

```
./generate-bundle.sh \
  -n ldap \
  -s bionic \
  --use-stable-charms \
  --overlay-network-type vxlan \
  --create-model \
  --num-compute 3 \
  --openstack-dashboard \
  --keystone-ha:3 \
  --ssl \
  --ldap
```

Below is my debugging to see the the units, and what was going on in the get_units function in helpers file

```
ubuntu@arif-ali-bastion:~/stsstack-bundles/openstack$ ./generate_ldap.sh
+ rm -rf ./b/ldap
+ ./generate-bundle.sh -n ldap -s bionic --use-stable-charms --overlay-network-type vxlan --create-model --num-compute 3 --ssl --openstack-dashboard --keystone-ha:3 --ldap
02configure ..... Using existing ssl certificates in ssl/openstack-ldap
--keystone-ha:3 __NUM_KEYSTONE_UNITS__ 3
--keystone-ha:3 __NUM_KEYSTONE_UNITS__ 3
REQUIRED: address of ldap server (leave blank to set later):
--ha:1 __NUM_HA_UNITS__ 3
--ha:1 __NUM_HA_UNITS__ 3
--cinder-ha:1 __NUM_CINDER_UNITS__ 3
--cinder-ha:1 __NUM_CINDER_UNITS__ 3
--glance-ha:1 __NUM_GLANCE_UNITS__ 3
--glance-ha:1 __NUM_GLANCE_UNITS__ 3
--keystone-ha:1 __NUM_KEYSTONE_UNITS__ 3
--keystone-ha:1 __NUM_KEYSTONE_UNITS__ 3
--neutron-api-ha:1 __NUM_NEUTRON_API_UNITS__ 3
--neutron-api-ha:1 __NUM_NEUTRON_API_UNITS__ 3
--nova-cloud-controller-ha:1 __NUM_NOVACC_UNITS__ 3
--nova-cloud-controller-ha:1 __NUM_NOVACC_UNITS__ 3
--openstack-dashboard-ha:1 __NUM_HORIZON_UNITS__ 3
--openstack-dashboard-ha:1 __NUM_HORIZON_UNITS__ 3
Juju model 'ldap' already exists and is the current context - skipping create

Created bionic-queens bundle and overlays (using stable charms):
  + neutron-gateway.yaml
  + neutron-openvswitch.yaml
  + mysql.yaml
  + openstack-dashboard.yaml
  + keystone-ha.yaml
  + ldap.yaml
  + ldap-test-fixture.yaml
  + neutron-ml2dns.yaml
  + neutron-ml2dns-gateway.yaml
  + neutron-ml2dns-openvswitch.yaml
  + cinder-ha.yaml
  + glance-ha.yaml
  + neutron-api-ha.yaml
  + nova-cloud-controller-ha.yaml
  + memcached.yaml
  + openstack-dashboard-ha.yaml

Command to deploy:
juju deploy ./b/ldap/openstack.yaml --overlay ./b/ldap/o/neutron-gateway.yaml --overlay ./b/ldap/o/neutron-openvswitch.yaml --overlay ./b/ldap/o/mysql.yaml --overlay ./b/ldap/o/openstack-dashboard.yaml --overlay
 ./b/ldap/o/keystone-ha.yaml --overlay ./b/ldap/o/ldap.yaml --overlay ./b/ldap/o/ldap-test-fixture.yaml --overlay ./b/ldap/o/neutron-ml2dns.yaml --overlay ./b/ldap/o/neutron-ml2dns-gateway.yaml --overlay ./b/lda
p/o/neutron-ml2dns-openvswitch.yaml --overlay ./b/ldap/o/cinder-ha.yaml --overlay ./b/ldap/o/glance-ha.yaml --overlay ./b/ldap/o/neutron-api-ha.yaml --overlay ./b/ldap/o/nova-cloud-controller-ha.yaml --overlay .
/b/ldap/o/memcached.yaml --overlay ./b/ldap/o/openstack-dashboard-ha.yaml --channel=stable
```