Merge r3366:

Merge r3366:

Add a debug CLI command to seed random(3).

This is a lot less useful than it could have been, as the Open Group
only mandates that:

        Like rand(), random() shall produce by default a sequence
        of numbers that can be duplicated by calling srandom() with
        1 as the seed.

But crucially leaves out *which* sequence of numbers.

git-svn-id: svn+ssh://projects.linpro.no/svn/varnish/branches/2.0@3532 d4fa192b-c00b-0410-8231-f00ffab90ce4