Adding option to disable SSL verification

[monitorjbl]

Fixes #22. Adding option to disable SSL verification

[nodje]

This address a very basic missing feature in the api_client.
Every TN instance is deployed with HTTPS only and self-manage certificate if I'm not mistaken.

This MR should be either accepted or another way to be able to skip SSL cert verification should be implemented.

It's 6month old already, why not review it? @kmoore134
And document it @Mrt134

[nodje]

ws:// is supported on default deployment
Still it'd be handy to be able to support WSS with self-signed.
I realize this MR is unfinished, as other verbs beyond call should also be supported.

[monitorjbl]

Updated my PR to touch the other commands. I haven't seen much activity from the truenas folks on github, so I've just been maintaining my own local fork to work around this problem.

[heapoutofspace]

Would be nice to have this merged, as ws:// is no longer supported by TN when using API keys:

For increased security, HTTPS with SSL/TLS transport security is required for TrueNAS API authentication using API keys. TrueNAS automatically revokes any user-linked API keys passed as part of an authentication attempt via insecure (HTTP) transport.