jetty-httpclient: Improve assert failure message (test*early_close)
jetty-httpclient: Add possible HttpResponseException to test_*early_close

With upgrade to 9.1.0, HttpResponseException is sporadically returned
in these tests, apparently due to some timing uncertainty.
jetty: Run test_early_close multiple times
jetty: Update to jetty 9.1.0

Updating the gem without the pom and rebuild fails with a java method
missing exception, so I suspect that this requires at least a iudex
MINOR version bump and can't be just a dependency broadening.
Lock update to rjack-jetty 9.1.1
Lock update for rjack-jetty 9.1.2
Lock update for rjack-jetty 9.1.3
Lock update for rjack-nekohtml 1.9.20.0
Lock for misc releases
Use top level 'uber' gem and spec
Fill in missing top-level (uber) History
Add ruby_version and license to gemspecs
da: Update to rjack-jdbc-postgres ~> 9.3.1100
da: Update to sequel 4.5.0

Conflicts:
	Gemfile.lock
da: Update to sequel 4.8.0
Lock update for rjack-jdbc-postgres 9.3.1101
da: Add WorkPoller.max_retries accessor
da: Add WorkPoller.isolation_level accessor
da: Add explicit LOCK mode to URLs table for WorkPoller

* Optional, default off
* Includes ContentReader support, but only for selectWithRetry as used
  by WorkPoller
da: Add exp. backoff to ContentReader.handleError retries