auth: add missing header file for std::replace

Signed-off-by: Noah Watkins <noahwatkins@gmail.com>
mon: add missing header for std::find

Signed-off-by: Noah Watkins <noahwatkins@gmail.com>
auth: add missing header for list

Signed-off-by: Noah Watkins <noahwatkins@gmail.com>
crush: add mising header for count

Signed-off-by: Noah Watkins <noahwatkins@gmail.com>
Merge pull request #821 from ceph/port/missing-headers

add missing headers

Reviewed-by: Sage Weil <sage@inktank.com>