HBASE-5516 GZip leading to memory leak in 0.90. Fix similar to HBASE-5387 needed for 0.90.

[rama krishna]

Hi Devs
Updated patch available for HBASE-5516 regarding memory leak using GZip.  It is 
for 0.90.
Please share your comments on it.  Ted has reviewed it from his side.
RegardsRam