Retry Gradle execution if it fails

[vlsi]

For instance, the following error should be safe to retry.

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring project ':buildSrc'.
> Could not resolve all artifacts for configuration ':buildSrc:classpath'.
   > Could not download bcprov-jdk15on-1.64.jar (org.bouncycastle:bcprov-jdk15on:1.64)
      > Could not get resource 'https://plugins.gradle.org/m2/org/bouncycastle/bcprov-jdk15on/1.64/bcprov-jdk15on-1.64.jar'.
         > Connection reset

See gradle/gradle#2598 (comment)