SSL + Powershell support

[obeleh]

Hey

I've added some changes so that this library also does SSL and Powershell commands.
The code for the powershell commands is "borrowed" from pywinrm.

I've also changed the host parsing so that it behaves a bit different. It used to be this:

host = parse_host('https://1.2.3.4', transport=TranportKind.http)

which would return 'https://1.2.3.4:5985/wsman' where port 5985 is the http port
That is of course garbage-in-garbage-out.

But I've changed it to this:

host = parse_host('https://1.2.3.4', default_transport=TranportKind.http)

which now returns 'https://1.2.3.4:5986/wsman' where port 5985 is the https port

Changing the behaviour allowed me to not force the "user" to provide a transport variable if he already supplied a url.

I've also removed the callbacks from the code examples and API calls. It is better practice to await your results in stead of providing callbacks.

I hope you find the changes useful.

[obeleh]

Hey,

I hope to get in contact and perhaps work together on this repository. I'll try and reach out to you in case this doesn't reach you.

[obeleh]

I'm currently in the process of adding PowerShell Remoting Protocol support. I'd really like to get in contact

[mattmess1221]

I don't know if you're still actively working on this, but can you use a dynamic package for kerberos? pykerberos isn't compatible with Windows. It's suggested to use winkerberos instead.

Adding this to setup.py makes it work out.

def kerberos():
    if os.name == 'nt':
        return 'winkerberos'
    return 'pykerberos >= 1.2.0'


INSTALL_REQUIRES = (
    ...
    kerberos(),
    ...
)

[obeleh]

I've transferred ownership of my branch to my previous employer since I've built it there. Can you open up a PR here? https://github.com/transceptor-technology/aio-winrm