[lib] make it possible to send DM ops to all thread members
Summary:
This is a fix for https://phab.comm.dev/D13187#inline-76074.
We going to specify threadID or parenThreadID depending on thread type.
Test Plan: Tested later in the stack - making sure ops are delivered to all members.
Reviewers: tomek, inka
Reviewed By: tomek
Subscribers: ashoat
Differential Revision: https://phab.comm.dev/D13193