PHOENIX-1401 SYSTEM.SEQUENCE table is not pre-split as expected

Conflicts:
	phoenix-core/src/main/java/org/apache/phoenix/coprocessor/MetaDataProtocol.java
PHOENIX-1397 RVC combined with OR on first row key column results in NPE (Samarth Jain)
PHOENIX-1401 SYSTEM.SEQUENCE table is not pre-split as expected