PHOENIX-674 Make unit test suite run faster (SamarthJain)
PHOENIX-63 Can't add null value to a secondary indexed table (SamarthJain)
PHOENIX-956 Connection properties ignored (SamarthJain)
PHOENIX-966 Context classloader for Phoenix classes

Temporarily set the current thread's context classloader in calls
that require creating an HBase configuration or accessing Phoenix
coprocessor endpoint classes.
Merge remote branch 'origin/apache-ref/4.0' into champlain