Revert "ACCUMULO-2234 Provide accumulo-site.xml to Mapper classpath and ensure is used by concrete Instance."

This reverts commit 57f9b6cfd30b1b2505efbacd2a5ce391dbcd1e0c.

Conflicts:
	src/core/src/main/java/org/apache/accumulo/core/client/mapreduce/InputFormatBase.java
	src/server/src/main/java/org/apache/accumulo/server/test/continuous/ContinuousVerify.java
ACCUMULO-2234 Replace usages of Instance.getConfiguration with the server-side configuration

Pull the site configuration from instanceOperations off of the Connector which gives
us access to the accumulo-site.xml file being used by that instance and alleviates the
need for us to provide it ourselves.
ACCUMULO-2234 Remove a no longer relevant javadoc message.