ACCUMULO-1858 revert commits that added ZooKeeperInstance.close()

Revert "ACCUMULO-2027 Synchronized access to ZooKeeperInstance methods that mutated state"

This reverts commit 975e8c05e8d11f3848e6c800f4d2772026f6c3a3.

Revert "ACCUMULO-1984 Rework interruption for instance implementations."

This reverts commit 0d0bc4643a8680593e2cf5f828b7566c30fcb345.

Conflicts:
	src/core/src/main/java/org/apache/accumulo/core/client/Instance.java
	src/core/src/main/java/org/apache/accumulo/core/zookeeper/ZooCache.java
	src/core/src/main/java/org/apache/accumulo/core/zookeeper/ZooReader.java

Revert "ACCUMULO-1889 mark ZKI as closed once close() is called."

This reverts commit ada4180379d46297c1531cf8065de5030d12953d.

Revert "ACCUMULO-1858 Backport ZooKeeper clean up to 1.4 and 1.5."

This reverts commit 79d686faa1e477b9cbd80c6f833ece402050b490.

Conflicts:
	src/core/src/main/java/org/apache/accumulo/core/client/Instance.java
	src/core/src/main/java/org/apache/accumulo/core/zookeeper/ZooCache.java
Merge branch '1.4.5-SNAPSHOT' into 1.5.1-SNAPSHOT

Conflicts:
	core/src/main/java/org/apache/accumulo/core/client/ZooKeeperInstance.java
	core/src/main/java/org/apache/accumulo/core/client/impl/ThriftTransportPool.java
	core/src/main/java/org/apache/accumulo/core/client/mock/MockInstance.java
	fate/src/main/java/org/apache/accumulo/fate/zookeeper/ZooReader.java
Merge branch '1.5.1-SNAPSHOT' into 1.6.0-SNAPSHOT

Conflicts:
	core/src/main/java/org/apache/accumulo/core/client/ZooKeeperInstance.java
	core/src/main/java/org/apache/accumulo/core/util/ThriftUtil.java
	core/src/test/java/org/apache/accumulo/core/client/impl/TabletLocatorImplTest.java
	server/base/src/main/java/org/apache/accumulo/server/client/HdfsZooInstance.java
ACCUMULO-2141 updating docs to 1.5 option parsing
Merge branch '1.5.1-SNAPSHOT' into 1.6.0-SNAPSHOT
ACCUMULO-1933 Make unit on memory parameters case-insensitive.

1. Added support for both cases for G, M, K and B

2. Added warning message for lower case b and that the code will consider this bytes

3. Added meaningful error message for any number formatting issues

4. Added unit test that test 1 and 3 from above.

 modified:   src/core/src/main/java/org/apache/accumulo/core/conf/AccumuloConfiguration.java

 new file:   src/core/src/test/java/org/apache/accumulo/core/conf/AccumuloConfigurationTest.java
Merge branch '1.5.1-SNAPSHOT' into 1.6.0-SNAPSHOT
ACCUMULO-2141 found a typo
Merge branch '1.5.1-SNAPSHOT' into 1.6.0-SNAPSHOT
Merge branch '1.6.0-SNAPSHOT' of https://git-wip-us.apache.org/repos/asf/accumulo into 1.6.0-SNAPSHOT