docs: No client keys are generated, but their existence is assumed

[Bel-Shazzar]

After following the documentation for the server configuration, including generating a client certificate I had not created any client keys.

Thus in the "Simple Client Configuration" I could not point to a myclient1.key file.

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Reported from: https://documentation.ubuntu.com/server/how-to/security/install-openvpn/

[cpaelzer]

Hi @Bel-Shazzar ,
where we point to what is created in https://documentation.ubuntu.com/server/how-to/security/install-openvpn/#create-client-certificates we list two already:

• pki/ca.crt
• pki/issued/myclient1.crt

There should be a third one, which is the myclient1.key you are missing.
We should change the docs to list this file as well, in my try a while ago it was created.
It should be in the same place in the following subdir.

$ cd /etc/openvpn/easy-rsa
$ ls -laF pki/ca.crt pki/issued/myclient1.crt pki/private/myclient1.key
-rw------- 1 root root 1204 Dec 18 07:51 pki/ca.crt
-rw------- 1 root root 4500 Dec 18 07:54 pki/issued/myclient1.crt
-rw------- 1 root root 1704 Dec 18 07:54 pki/private/myclient1.key

Could you check if you got the same, if so we really only need to mention its path and to copy that file as well in https://documentation.ubuntu.com/server/how-to/security/install-openvpn/#create-client-certificates.