Add missing API calls

[phsm]

Fixes #22

I've noticed that a lot of API calls are missing from the cloudstack/ directory.

Thus, I took listApis output from the latest Cloudstack version at the time of writing this, 4.19.1.2, and added all those missing calls to the layout.go.

There are 3 commits in the PR:

• One updates listApis to the newer Cloudstack version.
• The second one adds the missing API calls. I've also moved some calls to the Service they actually belong, e.g. createStoragePool is not a part of the PoolService, but of the StoragePoolService.
• The last commit contains all the files that make all generated

There were no errors/warnings during the make:

~/g/cloudstack-go main ↑2 ↓2 $ make all
go run generate/generate.go generate/layout.go generate/requiredParams.go --api=generate/listApis.json
~/g/cloudstack-go main* ↑2 ↓2 28.8s $