Renames and removal towards a unified ceph_objectstore_tool

Rename ceph_filestore_dump.cc and ceph_filestore_dump.py
Remove ceph_filestore_tool.cc

Signed-off-by: David Zafman <david.zafman@inktank.com>
Complete replacement of ceph_filestore_tool and ceph_filestore_dump
with unified ceph_objectstore_tool

Move list-lost-objects and fix-lost-objects features from
  ceph_filestore_tool to ceph_objectstore_dump
Change --type to --op for info, log, export...
Add --type for the ObjectStore type (defaults to filestore)
Change --filestore-path to --data-path
Update installation, Makefile.am, and .gitignore
Fix test case
  Add some additional invalid option checks

Signed-off-by: David Zafman <david.zafman@inktank.com>