reminder: Jenkins jobs available to all contributors

[Michael Brown <mi...@cloudera.com>]

For all contributors (this includes contributors who are not project
committers), the following Jenkins jobs are available to all Impala
contributors for testing patches they submit to Gerrit.

https://jenkins.impala.io/job/pre-review-test/

Use this to compile Impala and run, if desired, tests or test subsets.
bin/run-all-tests.sh in the source tree is the best place to understand the
meanings to the options of this job.

https://jenkins.impala.io/job/gerrit-verify-dryrun-external/ (new September
2017)

Use this to run the full set of verifications, including multiple
compilations of Impala using various build tools, and execution of all
backend tests, frontend tests, core end-to-end tests, and Apache RAT
verification. This is a wrapper around what a committer will ultimately run
for you to verify and submit your patch (gerrit-verify-dryrun).

Neither of these jobs write a comment or Verified bit or attempt to Submit
a Gerrit patch set. A submitter ought to monitor his or her job as it
progresses. A submitter is encouraged to manually link a successful job in
a Gerrit review comment as demonstration of success.

This language is also here:

https://cwiki.apache.org/confluence/display/IMPALA/Using+Gerrit+to+submit+and+review+patches#UsingGerrittosubmitandreviewpatches-Verifyingapatch(opentoallImpalacontributors)