ENG-5298: Fix double deletion when both elastic context and COW context are in
use.

If a tuple is pending delete by the COW context, the elatic context shouldn't
try to delete it again. Let the COW context take care of it after it's safely
scanned.
Demote a log message in activating table stream.

The elastic index can be missing when a index read request comes in in normal
operation. Leave the decision of printing the error message to the caller.
Merge pull request #886 from VoltDB/ENG-5298

ENG-5298: Fix double deletion when both elastic context and COW context are in use
ENG-5321: Check if the elastic index exists before trying to clear.
Fixed USING/WHERE/ALIAS combination
ENG-5321: Add a method to round trip an invocation for command logging.
Stabilize TestFuzzMeshArbiter
Merge pull request #891 from VoltDB/quiesce_test_fuz_mesh_arbiter

Stabilize TestFuzzMeshArbiter
Merge pull request #890 from VoltDB/ENG-5321

ENG-5321: Minor fixes related to elastic join and command log replay
ENG-5345: Add a stack trace to a the whacky error message.
Try and figure out which path is coming here.
Merge remote-tracking branch 'origin/ENG-451-self-join' into ENG-451-self-join-master-merge

Conflicts:
	tests/frontend/org/voltdb/planner/TestPlansJoin.java
Merge remote-tracking branch 'VoltDB/master' into ENG-451-self-join-master-merge