Squashed 'src/dmclock/' changes from 3408cb8f3c..a9e777f08f

Squashed 'src/dmclock/' changes from 3408cb8f3c..a9e777f08f

a9e777f08f Merge pull request #35 from joscollin/wip-warning-dmclock
45c63a5b10 Merge pull request #36 from ceph/wip-fix-functional
40a9fe55a6 With upgrade to gcc 7.1.1 need to include <functional> in additional header files.
a2dd155f08 src/dmclock_server.h: silence warning from -Wmaybe-uninitialized
0d6c7c6544 Merge pull request #24 from bspark8/wip_online_client_info_f
a5e8cdea31 Add unit test for update_client_info, dynamic_cli_info_f.
1faf3524c6 Modify each client's QoS parameter applied time from client_rec creation time to each request's tagging creation time.

git-subtree-dir: src/dmclock
git-subtree-split: a9e777f08f288fe6834599afdeefcd9c7d31e6c1