parasite: return ability to execute code in a thread with specified pid
parasite: return ability to execute code in a thread with specified pid

Currently we use id to get pid and other properties, which used when a
thread is daemonized. We are going to not demonize threads, so pid will
be only one useful field on parasite_thread_ctl.

Signed-off-by: Andrey Vagin <74c05afa918858348d6db8037d82fa8124870113@openvz.org>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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