Avoid always reinit the decompressor in the hot read path

When seting "hbase.block.data.cachecompressed=true", the cached blocks are decompressed when reading. But we are using pooled decompressors here, which means the decompressor configs should be refreshed as a prepare job before each decompressing, see the line here 

https://github.com/apache/hbase/blob/22526a6339afa230679bcf08fa1c917b04cdac6d/hbase-common/src/main/java/org/apache/hadoop/hbase/io/encoding/HFileBlockDefaultDecodingContext.java#L99

I have pointed out the lock of Configuration.get problem in HBASE-27672, it should be avoid when reiniting in the hot read path either.