Support Consul TLS

[sethvargo]

Currently only specifying the address is allowed, but there are many other options for Consul TLS like the CA file, key, and cert.

[erenfro]

I definitely need this as well.

[erenfro]

In my test environment, I had a very simple consul setup. But in my main environment where I was going to deploy fabio, consul is setup to be fully encrypting gossip and tls communications, which for fabio that means it won't work, at all.

[aaronhurt]

@sethvargo Sorry if this got put to the backlog. Is this still something that's needed mainline in fabio? Sorry for asking a redundant question if this has already be covered elsewhere.

[vjeantet]

Hello, need this too, deployment compromised.

How can we help to see fabio able to connect to consul via TLS and TLS with client connect ?

[magiconair]

@vjeantet I think the patch from @jen20 looks OK. If you can rebase that for master then we can merge it.