Cloudbox: python-nova-client installed via charms:folsom/updates does not accept cli arg --num-instances

Problem:

Cannot deploy multiple instances via older python-nova-client version installed via folsom/updates.

Output:

Executing Compute Benchmark Test
usage: nova [--version] [--debug] [--no-cache] [--timings]
Running all instances for 10 minute(s)
Getting running server list...
            [--os-username <auth-user-name>] [--os-password <auth-password>]
Instances available: -1
Failed: spawned: 60
            [--os-tenant-name <auth-tenant-name>] [--os-auth-url <auth-url>]
            [--os-region-name <region-name>] [--os-auth-system <auth-system>]
            [--service-type <service-type>] [--service-name <service-name>]
            [--volume-service-name <volume-service-name>]
            [--endpoint-type <endpoint-type>]
            [--os-compute-api-version <compute-api-ver>] [--insecure]
            [--bypass-url <bypass-url>]
            <subcommand> ...
error: unrecognized arguments: --num-instances 60
Try 'nova help ' for more information.

+----+---------------------+
| ID | Hypervisor hostname |
+----+---------------------+
| 1 | cffam.hp |
+----+---------------------+

+----------------------+--------+
| Property | Value |
+----------------------+--------+
| count | 1 |
| current_workload | 0 |
| disk_available_least | 788 |
| free_disk_gb | 790 |
| free_ram_mb | 128393 |
| local_gb | 790 |
| local_gb_used | 0 |
| memory_mb | 128905 |
| memory_mb_used | 512 |
| running_vms | 0 |
| vcpus | 32 |
| vcpus_used | 0 |
+----------------------+--------+