Merge pull request #7271 from somnathr/wip-transaction-delete

osd: avoid heap allocations for ObjectStore::Transaction

http://pulpito.ceph.com/sage-2016-01-28_12:50:51-rados-wip-sage-testing3---basic-mira/

Reviewed-by: Casey Bodley <cbodley@redhat.com>
Reviewed-by: Kefu Chai <kchai@redhat.com>

diff --cc src/os/filestore/FileStore.cc
Simple merge

diff --cc src/osd/OSD.cc
Simple merge

diff --cc src/osd/PG.cc
Simple merge

diff --cc src/tools/ceph_objectstore_tool.cc
Simple merge