ENG-5694: Pass snapshot fragment sp handle to the task log during live rejoin.
ENG-6137: Reduce allocations at live rejoin by slowing the spinning when re-adding RejoinProducer to the task queue
Remove extra linebreaks
ENG-5694: Set CompleteTransactionMessage's spHandle on the SPI.

The SPI sets the spHandle on the CompleteTransactionMessage when it sends them
to the replicas, but the one used on the SPI itself didn't have spHandle
set. Making sure that they all have a proper spHandle set.
ENG-5694: Pass voltroot path to the elastic join node coordinator.
ENG-6137: Readability cleanup
Merge pull request #1303 from VoltDB/ENG-6137

Eng 6137
Merge pull request #1294 from VoltDB/ENG-5694

ENG-5694: Pass snapshot fragment sp handle to the task log during live rejoin

r=izzy
Merge branch 'master' of github.com:VoltDB/voltdb into ENG-3233-stringfunc
ENG-6162: Check for in-progress-snapshot before issuing @SnapshotSave in
SnapshotDaemon.

If another is snapshot is still in progress somewhere in the cluster, don't
issue the next @SnapshotSave.
ENG-6162: Send feasibility check response back to SnapshotDaemon.

The response has to go back to SnapshotDaemon instead of going back to the
client directly so that whatever handling that needs to happen at the daemon
will happen.
Merge pull request #1305 from VoltDB/ENG-6162

ENG-6162: Check for in-progress-snapshot during feasibility check
performance charts: include five9s latency historams chart
performance charts: improve chart readabiltiy, add grids, fix x-axis ticks
Add own method to do string trim function, instead of the bad boost trim function
Merge branch 'master' of github.com:VoltDB/voltdb into ENG-3233-stringfunc