IMPALA-1245: Fix log spew (mainly from FE)

Change-Id: Ib9fc89d4cc0ae87cbd4d41e760c742a130712991
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4473
Reviewed-by: Marcel Kornacker <marcel@cloudera.com>
Tested-by: jenkins
IMPALA-1289: Fix predicate assignment for inverted joins.

Change-Id: I017c39f77df0264a7ee35dca28ee263aa55ca517
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4491
Reviewed-by: Marcel Kornacker <marcel@cloudera.com>
Tested-by: jenkins
Fix for bug in AnalyticExpr.resetAnalysisState()

Fixes:
IMPALA-1256: Nested analytic: AnalysisException: select list expression not produced by aggregation output
IMPALA-1280: Crash running analytic with LEFT SEMI JOIN

Change-Id: I98b8f90de0079afad5b2d547abc27bcee57651f3
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4500
Reviewed-by: Alex Behm <alex.behm@cloudera.com>
Tested-by: jenkins
Fix session expiration test.

The session expiration test would occasionally fail because two sessions ended up expiring
at approximately the same time. This patch ensures that no session is active when the
initial metric value is polled.

Change-Id: Ib62e7c23fb0c43e0e8ee0c17770d47df19964117
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4502
Reviewed-by: Ishaan Joshi <ishaan@cloudera.com>
Tested-by: jenkins