[Integrated] RFR: Reuse HttpClient instances

[Robin Westberg]

Changeset: 2596472f
Author:    Robin Westberg <rwestberg at openjdk.org>
Date:      2020-03-23 12:11:46 +0000
URL:       https://git.openjdk.java.net/skara/commit/2596472f

Reuse HttpClient instances

Reviewed-by: ehelin

! bots/mlbridge/src/main/java/org/openjdk/skara/bots/mlbridge/WebrevStorage.java
! forge/src/main/java/org/openjdk/skara/forge/github/GitHubApplication.java
! mailinglist/src/main/java/org/openjdk/skara/mailinglist/mailman/MailmanList.java