ENG-6220: and also changed a ack from future log to debug...just not useful for support. (ENG-6212)
Merge branch 'master' into ENG-6220
Merge pull request #1311 from VoltDB/ENG-6220

ENG-6220: and also changed a ack from future log to debug...just not use...
Unrelated, remove inappropriate use of LTQ which spins
Add missing import
Remove unused parameter requestId from SnapshotDaemon.initiateSnapshot().
ENG-6205: Handle snapshot feasibility check timeout properly.
Unrelated add another missing import
ENG-6232: Fix off-heap memory for acks.
Merge pull request #1323 from VoltDB/ENG-6232

ENG-6232: Fix off-heap memory for acks.
Merge pull request #1324 from VoltDB/ENG-6153-2

Eng 6153 2
ENG-6205: Prevent calling @SnapshotSave back to back.

Track the previous call to @SnapshotSave so that when a new snapshot is
requested, the SnapshotDaemon won't issue another one if the previous one hasn't
responded.

It's okay if the previous one is still in progress, the feasibility check will
take care of that. We just care about queued but not executed @SnapshotSave.
For ENG-6153, try handling durabillity notifications in the site threads
Merge pull request #1326 from VoltDB/ENG-6153-2

For ENG-6153, try handling durabillity notifications in the site threads...
ENG-6231: If the JDBC connection URL contains even one valid and
functional VoltDB node, go ahead and connect.
Merge pull request #1328 from VoltDB/eng6231

ENG-6231: If the JDBC connection URL contains even one valid and functional VoltDB node, go ahead and connect.

r=jhugg
ENG-6242: Fix null timestamp sigil handling in ParameterConverter.
Merge pull request #1327 from VoltDB/ENG-6205

ENG-6205: Prevent back to back @SnapshotSave.
Fix a new test issue where we'd offer transactions in the test after
killing nodes before the repair process had finished.  Add a little
time after each node kill, and add a catch-all check in the
exceptional case to avoid false failures.
Merge pull request #1329 from VoltDB/ENG-6242

ENG-6242: Fix null timestamp sigil handling in ParameterConverter.

r=izzy, akhanzode