[youjizz] Don't make the url protocol optional (fixes #3722)

It would fail to download the webpag if it's missing.
And the generic extractor will add it.
[youtube] Don't make the url protocol optional

The generic extractor will add it.
[utils] Default SSL to TLS. (Fixes #3727)

On 2.x, we now try TLS first, and fall back to the compat 23 (basically anything) afterwards.
On 3.4+, we now use the proper function so that we get all the latest security configurations.
We allow SSLv3 though for the time being, since a lot of older pages use that.
On 3.3, we default to SSLv23 (basically "anything, including TLS") because that has the widest compatibility.
release 2014.09.12