Added dumpling v0.67.9 version, removed older versions v0.67.2, v0.67.4,...

@tmuthamizhan @wusui 
@jdurgin 

Please review and merge.

Added dumpling v0.67.9 version, removed older versions v0.67.2, v0.67.4, v0.67.8

This will reduce number of tests to run, some  tests may failed on old versions, see http://tracker.ceph.com/issues/8409

Signed-off-by: Yuri Weinstein <yuri.weinstein@inktank.com>