provider/cloudstack: add new provider option and some more...

[svanharmelen]

• Added a new provider option to only use HTTP GET calls (needed by some cloud providers)
• Updated a few resources (incl. their docs) so you can supply either a resource name or ID
• Added a retry func for creating ACL rules, as sometimes creating the the ACL and it's rules to fast will cause the rule creation to fail
• Added a new resource cloudstack_secondary_ipaddress incl. tests and docs

Executed all (acceptance) tests after the last commit, which executed without any errors.

[svanharmelen]

@phinze if you have a minute to do a quick review, that would be great!

[phinze]

LGTM!

[svanharmelen]

@phinze thanks!

[larstobi]

@svanharmelen Thanks! 👍

[ghost]

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