[Integrated] RFR: Adhere to GitHub's search rate limit

[Robin Westberg]

Changeset: d435e278
Author:    Robin Westberg <rwestberg at openjdk.org>
Date:      2020-02-25 13:20:16 +0000
URL:       https://git.openjdk.java.net/skara/commit/d435e278

Adhere to GitHub's search rate limit

Reviewed-by: ehelin

! forge/src/main/java/org/openjdk/skara/forge/github/GitHubHost.java