PHOENIX-1434 Stats are not maintained correctly through splits (Mujtaba)
PHOENIX-1432 Run limit query that has only leading PK column filter serially

Conflicts:
	phoenix-core/src/it/java/org/apache/phoenix/end2end/HashJoinIT.java
	phoenix-core/src/it/java/org/apache/phoenix/end2end/StatsCollectorIT.java
	phoenix-core/src/main/java/org/apache/phoenix/coprocessor/MetaDataEndpointImpl.java
	phoenix-core/src/main/java/org/apache/phoenix/execute/ScanPlan.java
	phoenix-core/src/main/java/org/apache/phoenix/iterate/ParallelIterators.java
	phoenix-core/src/main/java/org/apache/phoenix/schema/stats/StatisticsCollector.java
	phoenix-core/src/main/java/org/apache/phoenix/schema/stats/StatisticsUtil.java
	phoenix-core/src/main/java/org/apache/phoenix/schema/stats/StatisticsWriter.java
	phoenix-core/src/main/java/org/apache/phoenix/util/ServerUtil.java
PHOENIX-1429 Cancel queued threads when limit reached
PHOENIX-1427 Reduce work in StatsCollector

Conflicts:
	phoenix-core/src/main/java/org/apache/phoenix/schema/stats/StatisticsCollector.java
	phoenix-core/src/main/java/org/apache/phoenix/schema/stats/StatisticsUtil.java
	phoenix-core/src/main/java/org/apache/phoenix/schema/stats/StatisticsWriter.java
PHOENIX-1446 Add/fix logging for LIMIT optimization

Conflicts:
	phoenix-core/src/main/java/org/apache/phoenix/iterate/BaseResultIterators.java
	phoenix-core/src/main/java/org/apache/phoenix/jdbc/PhoenixStatement.java
	phoenix-core/src/main/java/org/apache/phoenix/util/QueryUtil.java
PHOENIX-1447 Increase guidepost width default to take into account FAST_DIFF compression
PHOENIX-1448 Fix resource leak when work rejected by thread executor
PHOENIX-1449 Fix potential NPE in delete