Refactor ErasureCodeLrc::create_ruleset

Refactor ErasureCodeLrc::create_ruleset
1.Use CrushWrapper instead of crush C-api.
2.Make ruleset_id == rule_id, consist as the behavior in
  CrushWrapper::add_simple_ruleset().

Signed-off-by: Xiaoxi Chen <xiaoxi.chen@intel.com>
Should it also call **crush.finalize()** at the end ?