+act #15383 add strict japi.Option.getOrElse to simplify working with options from Java

(cherry picked from commit 657afbd8591b28c1aef137520479d789bdfae83d)
Merge pull request #15432 from spray/w/add-japi-Option-getOrElse-backport-to-2.3

+act #15383 add strict japi.Option.getOrElse to simplify working with options from Java (backport)