Allow Explicit HTTPS for the Solr Importer Plugin

[DiegoPino]

What?

It seems like HTTP is encoded as a default in the Solarium Client, so we need at least two new settings when dealing with remote (proxied) solr

• A Schema (HTTP or HTTPS)
• Still a port stays (because HTTPs can be served under different ports)
• A way of overriding $this->getPath() (which is by default /solr)

@alliomeria I noticed this here: https://github.com/solariumphp/solarium/pull/276/files

[DiegoPino]

Resolved via https://github.com/esmero/ami/commit/f9d012e7ef563df4f909db3c14b4ba20eaac6e94