Fix SSL tunnel socket

[wiggin15]

Maybe I'm not using the SSLTunnelConnection correctly but this looks like an internal problem - without this change, I'm getting the following error:

pyVmomi.VmomiSupport.HostConnectFault: (vim.fault.HostConnectFault) {
   dynamicType = <unset>,
   dynamicProperty = (vmodl.DynamicProperty) [],
   msg = 'must be _socket.socket, not socket',
   faultCause = <unset>,
   faultMessage = (vmodl.LocalizableMessage) []
}

[hartsock]

Could we get an issue for this with steps to reproduce?

[wiggin15]

Turns out that this happens because we use gevent's patching.
I will open a ticket with code that reproduces this.

[wiggin15]

Updated pull request

[wiggin15]

I added a test (without gevent for the moment). The test is a bit tricky because a) vcrpy was not built to be wrapped by ssl so I had to patch it using the existing monkey_patch_vcrpy function, and b) I had to call SoapStubAdapter directly - see comment in #156.
Let me know what you think.

[hartsock]

Pulled locally for review.