[HBASE-14334] Move Memcached block cache in to it's own optional module. - ASF JIRA

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Move external block cache to it's own module. This will reduce dependencies for people who use hbase-server.
Currently Memcached is the reference implementation for external block cache. External block caches allow HBase to take advantage of other more complex caches that can live longer than the HBase regionserver process and are not necessarily tied to a single computer
life time. However external block caches add in extra operational overhead.

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Move external block cache to it's own module. This will reduce dependencies for people who use hbase-server. Currently Memcached is the reference implementation for external block cache. External block caches allow HBase to take advantage of other more complex caches that can live longer than the HBase regionserver process and are not necessarily tied to a single computer life time. However external block caches add in extra operational overhead.