* Wrap all conditional loads in `BEGIN {}` to be closer to the
behavior of `use`.
* Add missing `Test::Warnings`, `HTTP::Request` loads.
* Sort by module name, except load `Test::More` first and
`Test::Warnings` immediately after to maximize checking
effectiveness.
* Return truthy from `eval` block to prevent the `or` case from
executing if the loaded module does not have a final truthy
statement. (Except for `ddclient` because we want to test that it
does have a final truthy statement.)
The `ssl` option is a global option, not a per-host option. This
commit could instead do:
local $ddclient::globals{ssl} = 0;
but it's more straightforward to include `http://` in the `server`
option, and it tests that `server` supports the inclusion of the
scheme.
