[CRIU] [PATCH 4/6] dump: dump signals before infecting with parasite

[Ruslan Kuprieiev]

Ok, we had a private talk with Andrew.
He pointed out that we have a problem with no relation to current patch set.
The problem is:
     -- the tree consists of 2 tasks: task1 and task2
     -- we seize task1
     -- task2 sends signal to task1
     -- we seize task2
     -- In result, that signal is lost

Will try to solve this issue and send patch a bit later. Meanwhile, consider
this set of patches.