Checks that the handler for the API call even exists before verifying the
parameter schema. By this the reported error message is more descriptive.
Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Do not add/extract standard options if the method itself defined properties
using the same names (like 'quiet').
Signed-off-by: Dietmar Maurer <dietmar@proxmox.com>
Most of those API calls return simple strings, so it does not really matter.
Nethertheless, some calls return complex data structures and we want to set
output format for them.
