Update CI scripts so that command failures do not cause an immediate
exit. Prior to this commit, some of our looping logic would never run
because the entire script would exit.
Increase the timeout used when checking if artifacts have landed in
Bintray from 20m to 40m. Also added some additional protection against
the curl command failing.
Closes gh-16443
Due to timeouts while distributing release artifacts,
this commit uses the async mode for distribution.
Before syncing to maven central, we need to check if all the artifacts
have been published to Bintray. This is done by hitting the Bintray API
till we get the version or until a timeout is reached.
Closes gh-12292
Phillip Webb
Madhura Bhave