ACCUMULO-1537 completed the conversion of functional tests to IT; also converted ShellServerTest to an IT

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1501497 13f79535-47bb-0310-9956-ffa450edef68
Merge branch 'trunk' into ACCUMULO-802

Conflicts:
	test/src/test/java/org/apache/accumulo/test/ShellServerIT.java