[5.1] Yet another another attempt to fix Swift Mailer related SSL failures (Issue #4573)

[YOzaz]

Hi, updated way of doing transport reset.

[YOzaz]

Right... tests need to be updated.

[taylorotwell]

Mailgun transport for example has no "reset" method?

[YOzaz]

Update from my side: it's working correctly for half of the year already.

[taylorotwell]

@YOzaz you're not addressing the problem. Not all drivers even have a reset method to call.

[YOzaz]

@taylorotwell you're absolutely right, and I'm not complaining. Just saying that with SwiftMailer it works - therefore I had something like this implemented in my project when I was testing:

if ( ! is_a( $transport, '\Swift_Transport_AbstractSmtpTransport' ) )

... or we can even check if there's a "transport" at all.
But don't want to patch this PR further until you'll make a decision it's required. In either case, current reset (present in Laravel core) doesn't work.

[taylorotwell]

You may want to check if method_exists($transport, 'reset')

[YOzaz]

@taylorotwell done: 4048a64

[YOzaz]

But still, travis is failing, and I'm not sure how to fix it.