parasite: Add @pad argument for syscall run
parasite: Add @pad argument for syscall run

We will need an extra space for memfd based
syscall (without poking the stack since it's
not that safe without additional tests).

So add @pad argument which will be used
to find proper memory for seized syscall
execution.

Signed-off-by: Cyrill Gorcunov <7a1ea01eee6961eb1e372e3508c2670446d086f4@openvz.org>
Looks-good-to-me: Andrew Vagin <74c05afa918858348d6db8037d82fa8124870113@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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