This doesn't yet cover all the functions in gtpie.[ch], but testing half
of them is better than not testing any of them, so let's merge this
current state with a couple of TDOO's on what we still need to test.
Change-Id: I30a6dd8a01b7a074ef2d3936d186dfff6c79e6c0
This test creates a variety of v4 (and one v6) pool and performs
allocations until the pool is full, then frees a random number of
randomly distributed addresses, re-allocates them and again checks that
they're all available and finally once the pool is full allocations
fail.
Change-Id: Ibf4588e8f3ae71684e5262c0caaa2689aee73a94