multiple `--units` or ` --machines` arguments are ignored

[esunar]

If provide multiple --units or --machines arguments that only the last one will be considered and no warning will be provided.

How it currently works:

(juju-verify) ➜  juju-verify git:(master) ✗ juju-verify reboot --units ceph-osd/0 --units ceph-osd/1 -l debug
Connecting to currently active model.
Inferred charm for unit ceph-osd/1: ceph-osd
Initiating verifier instance of class: CephOsd
Running check reboot on units: ceph-osd/1
Result: OK
Reason: ceph-mon/2: Ceph cluster is healthy

How it should works:

(juju-verify) ➜  juju-verify git:(master) ✗ juju-verify reboot --units ceph-osd/0 --units ceph-osd/1 -l debug
Connecting to currently active model.
Inferred charm for unit ceph-osd/0: ceph-osd
Inferred charm for unit ceph-osd/1: ceph-osd
Initiating verifier instance of class: CephOsd
Running check reboot on units: ceph-osd/0,ceph-osd/1
Result: OK
Reason: ceph-mon/0: Ceph cluster is healthy

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Imported from Launchpad using lp2gh.

• date created: 2021-03-23T11:47:02Z

• owner: rgildein

• assignee: rgildein

• the launchpad url

[esunar]

(by rgildein) I think that "extend" action 1 should be used to prevent this situation.

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[esunar]

(by rgildein) MP: https://code.launchpad.net/~rgildein/juju-verify/+git/juju-verify/+merge/400337