Glauber Costa ffc2131c51 decouple estimated_histogram from sstables ...

There is nothing really that fundamentally ties the estimated histogram to
sstables. This patch gets rid of the few incidental ties. They are:

 - the namespace name, which is now moved to utils. Users inside sstables/
   now need to add a namespace prefix, while the ones outside have to change
   it to the right one
 - sstables::merge, which has a very non-descriptive name to begin with, is
   changed to a more descriptive name that can live inside utils/
 - the disk_types.hh include has to be removed - but it had no reason to be
   here in the first place.

Todo, is to actually move the file outside sstables/. That is done in a separate
step for clarity.

Signed-off-by: Glauber Costa <glauber@scylladb.com>

2016-08-31 15:13:23 -04:00

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