Add instructions for local ISO SR on multi host pool

[AtaxyaNetwork]

I just have come across the following use case:
2 hosts in a pool, and wanted to create a Local ISO SR
If l follow the doc, I have this error:

[19:33 Delirium ~]# xe sr-create name-label="ISO Repository" type=iso device-config:location=/opt/var/iso_repository device-config:legacy_mode=true content-type=iso
Error: Required parameter not found: host-uuid

So with xe host-list, I retrieve my host uuid:

[19:34 Delirium ~]# xe host-list 
uuid ( RO)                : 7b84f233-8aa3-468d-b254-fd585194da21
          name-label ( RW): Delirium
    name-description ( RW): heart beer

Then I can create my SR:

[19:34 Delirium ~]# xe sr-create name-label="ISO Repository" type=iso device-config:location=/opt/var/iso_repository device-config:legacy_mode=true content-type=iso host-uuid=7b84f233-8aa3-468d-b254-fd585194da21 
953fcd3b-a4d5-1092-c4eb-1782cee0ff0b

I don't remember if a standalone XCP-ng have the same behavior (I don't think so), but I can test it if you want :)

Thank you for all your work !

Before submitting the pull request, you must agree with the following statements by checking both boxes with a 'x'.

• "I accept that my contribution is placed under the CC BY-SA 2.0 license [1]."
• "My contribution complies with the Developer Certificate of Origin [2]."

[1] https://creativecommons.org/licenses/by-sa/2.0/
[2] https://xcp-ng.org/docs/contributing.html#developer-certificate-of-origin-dco

[stormi]

Suggested change

	If your host are in a pool, you need to get the host uuid first:
	If your host is in a pool of several hosts, you need to get the host uuid first:

[stormi]

Does a local ISO SR work when the VM is on a different host of the pool? I don't think it does.

[AtaxyaNetwork]

Indeed, the local ISO SR doestn't work on a VM on an other host of the pool
I think it's a good idea to specify this

[AtaxyaNetwork]

Commit updated :)

[stormi]

Here's my proposal to make it shorter while retaining the essential information.

[AtaxyaNetwork]

I try to push your suggestion, but I think something went wrong 🤔

[stormi]

I added my missing suggestion again. You just need to approve it. No need to force push your branch, I'll squash the commits together when merging.

[AtaxyaNetwork]

If I click on "sign off and commit suggestion", the DCO check will fail (that's why I have to force push). If you squash the commit after the DCO will be ok ?

[stormi]

Yes, the DCO will be good in the end as I'll make sure the squashed commit retains your sign-off

[AtaxyaNetwork]

Ok, done !

[stormi]

It's merged. Thanks for your contribution :)