ACCUMULO-1472 Rely solely on classpath from the invoking application and prevent extra warnings from being logged.

Create lib/ext so that the classloader doesn't WARN. Since the applications
will inherit the classpath from the invoking application, we shouldn't try
to pull jars from environment vars (as they will rarely be correct) and add
them to the classpath too. Sadly, we must set *something*, otherwise the
AccumuloClassLoader will revert back to some default and load things
we don't want.
Merge branch '1.4.5-SNAPSHOT' into 1.5.1-SNAPSHOT
ACCUMULO-2312 test was expecting overly wrapped errors
Revert "ACCUMULO-2312 test was expecting overly wrapped errors"

This reverts commit 722d6be1d05cdafac17a424c5e91bc166d622231.
Merge branch '1.5.1-SNAPSHOT' into 1.6.0-SNAPSHOT

Conflicts:
	minicluster/src/main/java/org/apache/accumulo/minicluster/MiniAccumuloCluster.java
Merge branch '1.6.0-SNAPSHOT' of https://git-wip-us.apache.org/repos/asf/accumulo into 1.6.0-SNAPSHOT
ACCUMULO-2060 Add a better defaults to the classloader defaults.
Merge branch '1.4.5-SNAPSHOT' into 1.5.1-SNAPSHOT

Conflicts:
	src/start/src/main/java/org/apache/accumulo/start/classloader/AccumuloClassLoader.java
ACCUMULO-2314 Fix nit typographical/grammar issues.

Signed-off-by: Bill Havanki <bhavanki@cloudera.com>
Merge branch '1.4.5-SNAPSHOT' into 1.5.1-SNAPSHOT (-sours)
Merge branch '1.5.1-SNAPSHOT' into 1.6.0-SNAPSHOT
ACCUMULO-2318 making rename's second argument require a namespace
ACCUMULO-2316 No more namespacenotfound for table requests
ACCUMULO-2317 banishing loadDefault(String) and providing adequate documentation to the constructor
ACCUMULO-2312 NPE fixed by 2316/2318, but making message better
Merge branch '1.5.1-SNAPSHOT' of https://git-wip-us.apache.org/repos/asf/accumulo into 1.5.1-SNAPSHOT
Merge branch '1.5.1-SNAPSHOT' into 1.6.0-SNAPSHOT
ACCUMULO-2317 Missed these errors
ACCUMULO-2248 properly catch wrapped NamespaceNotFoundException in concurrent
Merge branch '1.6.0-SNAPSHOT' of https://git-wip-us.apache.org/repos/asf/accumulo into 1.6.0-SNAPSHOT