[Integrated] RFR: Add support for offline and local builds

[Erik Helin]

Changeset: f3881b62
Author:    Erik Helin <ehelin at openjdk.org>
Date:      2019-11-11 07:51:16 +0000
URL:       https://git.openjdk.java.net/skara/commit/f3881b62

Add support for offline and local builds

Co-authored-by: Nick Gasson <nick.gasson at arm.com>
Reviewed-by: rwestberg

! README.md
! bots/cli/build.gradle
! build.gradle
! buildSrc/images/src/main/java/org/openjdk/skara/gradle/images/ImagesPlugin.java
! buildSrc/images/src/main/java/org/openjdk/skara/gradle/images/LaunchersTask.java
! buildSrc/images/src/main/java/org/openjdk/skara/gradle/images/LinkTask.java
! cli/build.gradle
! deps.env
! gradlew
! gradlew.bat