Description of problem:

[RFE] Change default values for filestore split/merge 

In recent customer cases we have seen keeping default value 320 is good but for getting number 320 is better to have:

filestore merge threshold = 1 
filestore split multiple = 20 

This will prevent merging of directories.

Current defaults are:

http://docs.ceph.com/docs/master/rados/configuration/filestore-config-ref/#misc

filestore merge threshold = 10 
filestore split multiple = 2


Version-Release number of selected component (if applicable):
Red Hat Ceph Storage 1.3.2