Add support for Go recovered panics

[kasparjarek]

When Go panic is recovered and thrown again it duplicates the first line of panic suffixed with [recovered]. The finite automaton is currently unable to recognise this panic output.

panic: foo [recovered]
	panic: foo [recovered]
	panic: foo [recovered]
	panic: foo

goroutine 1 [running]:
main.recoverAndPanic()
	/tmp/sandbox1820875720/prog.go:12 +0x34
panic({0x459120, 0x476600})
	/usr/local/go-faketime/src/runtime/panic.go:838 +0x207
main.recoverAndPanic()
	/tmp/sandbox1820875720/prog.go:12 +0x34
panic({0x459120, 0x476600})
	/usr/local/go-faketime/src/runtime/panic.go:838 +0x207
main.recoverAndPanic()
	/tmp/sandbox1820875720/prog.go:12 +0x34
panic({0x459120, 0x476600})
	/usr/local/go-faketime/src/runtime/panic.go:838 +0x207
main.main()
	/tmp/sandbox1820875720/prog.go:7 +0x5d

The output is produced by following code:

package main

func main() {
	defer recoverAndPanic()
	defer recoverAndPanic()
	defer recoverAndPanic()
	panic("foo")
}

func recoverAndPanic() {
	if r := recover(); r != nil {
		panic(r)
	}
}

BTW I have created the same PR also for the upstream repo GoogleCloudPlatform#98