CAF::Download::LWP: Remove fall back to Net::SSL

[jrha]

CAF::Download::LWP falls back to Net::SSL when libwww-perl is older than 5.833.

LWP 5.833 is 16 years old and EL6 was the last distro we supported that shipped it, we should strip out this unnecessary complexity and the related tests.

[stdweird]

@jrha something in the back of my mind says that LWP is used by Negotiate (something to do with Kerberos)

[jrha]

Thanks I'll dig in further to see where and how it is used, keeping LWP around should be fine though, just not Net::SSL.