Print solr url on start

This is useful info to see which url has been selected, same as db
connection.

modules/restserver/src/main/scala/docspell/restserver/Main.scala

@@ -46,7 +46,8 @@ object Main extends IOApp {
       cfg.backend.jdbc.url,
       Option(System.getProperty("config.file")),
       cfg.appId,
-      cfg.baseUrl
+      cfg.baseUrl,
+      Some(cfg.fullTextSearch.solr.url).filter(_ => cfg.fullTextSearch.enabled)
     )
     val pools = for {
       cec <- connectEC