createUser/updateUser APIs need to be POST

[Marcus Sorensen]

cloudstack-go/generate/generate.go

Line 1701 in 0d335ef

 if a.Name == "deployVirtualMachine" || a.Name == "login" || a.Name == "updateVirtualMachine" { 

The generation code uses post calls for a subset of APIs that are sensitive or large. Eventually the listApis should advertise which APIs these are, but until then we need to switch these createUser and updateUser calls (and any other that may send sensitive info) over to use POST.

[rohit-satya]

@mlsorensen Please assign this to me

[Abhishek Kumar]

@rohit-satya there is already a PR for this now, #86. You may help review/test that