apache, nginx plugins: Added "Verify{Peer,Host}" configuration options.

"VerifyPeer" may be used to disable peer SSL certificate verification and
"VerifyHost" may be used to disable peer host name (as provided by the SSL
certificate's CA or SAN fields) verification.

Using both options is similar to curl's "--insecure" command line
option.

As requested by Joerg Jaspert.

Signed-off-by: Sebastian Harl <sh@tokkee.org>
Signed-off-by: Florian Forster <octo@huhu.verplant.org>