[HBASE-7320] Remove KeyValue.getBuffer() - ASF JIRA

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In many places this is simple task of just replacing the method name.
There, however, quite a few places where we assume that:

Some of those can easily be fixed, others will need their own jiras.

is related to

HBASE-9794 KeyValues / cells backed by buffer fragments

relates to

HBASE-10944 Remove all kv.getBuffer() and kv.getRow() references existing in the code

HBASE-9383 Have Cell interface extend HeapSize interface

HBASE-7319 Extend Cell usage through read path

HBASE-11425 Cell/DBB end-to-end on the read-path

1.	Deprecate KeyValue#getBuffer	Closed	Michael Stack
2.	Replace KV.getBuffer with KV.get{Row\|Family\|Qualifier\|Value\|Tags}Array	Closed	Lars Hofhansl
3.	Make Cell extend Cloneable	Closed	ramkrishna.s.vasudevan
4.	Add util methods in CellUtil	Closed	ramkrishna.s.vasudevan
5.	Revisit how the key byte[] is passed to HFileScanner.seekTo and reseekTo	Closed	ramkrishna.s.vasudevan
6.	Make KeyValueComparator in KeyValue to accept Cell instead of KeyValue.	Closed	ramkrishna.s.vasudevan
7.	Check if the block keys, index keys can be used as Cells instead of byte[]	Closed	ramkrishna.s.vasudevan
8.	Ensure DBE interfaces can work with Cell	Closed	ramkrishna.s.vasudevan
9.	Change ScanQueryMatcher to use Cells instead of KeyValue.	Closed	ramkrishna.s.vasudevan
10.	Change Filters and GetClosestRowBeforeTracker to work with Cells	Closed	ramkrishna.s.vasudevan
11.	Remove all kv.getBuffer() and kv.getRow() references existing in the code	Closed	Unassigned
12.	Remove kv.isDeleteXX() and related methods and use CellUtil apis.	Closed	ramkrishna.s.vasudevan
13.	Support Cell to be passed to StoreFile.Writer rather than KeyValue	Closed	Anoop Sam John
14.	Change Writer/Readers factory to create CellComparators rather than KVComparator	Closed	Unassigned