Updated keycloak_client.go to support keycloak 22

[wombat]

RH SSO changed the ".GA" string at the end of the version to "redhat-00002" with the release of Red Hat Build of Keycloak. I added a more generic approach in case Red Hat changes the number at the end of the version string.

Sample string from the latest release: 22.0.6.redhat-00002

With the provided change we were able to run our Keycloak provisioning successfully without the following error that we see in the 4.3.1:

Error: error initializing keycloak provider
│
│   with provider["registry.terraform.io/mrparkers/keycloak"],
│   on main.tf line 7, in provider "keycloak":
│    7: provider "keycloak" {
│
│ failed to perform initial login to Keycloak: Malformed version: 22.0.6.redhat-00002

[simonregn]

Hi @mrparkers
I have been working with @wombat on this case. Could you please have a look at this? Can this be merged and released?
Thanks :)

[andreas-sundstrom]

Great work guys! This would help our team out a lot! 👍⭐👍

[johnalmm]

Same for my team!

[mrparkers]

Sorry for the late review on this. This looks good to me, although I can't verify myself since I don't have access to RedHat SSO. But I'll trust you guys on this one.

Thanks for the PR!

[simonregn]

Any plans to release this soon?

[johnalmm]

Great work!
Yes, getting this to the terraform registry would be golden.

[johnalmm]

@mrparkers Do you have any reason for not doing a new release on the terraform registry with this feature? Could we help out with anything to help make it happen?