Refactor goroutine leaks checker

[rihter007]

Make multiple iterations checks to reduce sleep time in case no goroutines leaked

[mimir-d]

can you provide a before and after output for a leak detection? (on account of removing some of the field details)

[rihter007]

can you provide a before and after output for a leak detection? (on account of removing some of the field details)

there are unit tests if you suspect a bug

[mimir-d]

i just wanted to see how that looks, since fields were removed. and how that makes the tests run faster

[rihter007]

i just wanted to see how that looks, since fields were removed. and how that makes the tests run faster

Something like that:

leaked goroutines:
goroutine 22 [sync.Cond.Wait]:
sync.runtime_notifyListWait(0xc000090990, 0x1)
/usr/local/go/src/runtime/sema.go:513 +0x13d
sync.(*Cond).Wait(0x0)
/usr/local/go/src/sync/cond.go:56 +0x8c
github.com/linuxboot/contest/tests/common/goroutine_leak_check.Func1(0xc000090980)
/Users/ilyaarzamartsev/projects/contest/tests/common/goroutine_leak_check/goroutine_leak_check_test.go:19 +0x3d
created by github.com/linuxboot/contest/tests/common/goroutine_leak_check.TestLeaks
/Users/ilyaarzamartsev/projects/contest/tests/common/goroutine_leak_check/goroutine_leak_check_test.go:30 +0x9d

Actually same as before, previous implementation just made extra parsing that is not needed.

Why faster?

Instead of the logic:

Sleep(A_LOT)
checkLeakedGoroutines()

The new logic is

for tryIdx = 0; tryIdx < {
if checkLeakedGoroutines() == nil {
   break
}
Sleep(little)
}

So, new implementation should be faster...