operator to prepend bgp path multiple times

[Alexander Zubkov]

Hi,

I suggest to add a new operator: prepend_times(P, A, N) - that will
allow to prepend AS A to path P several times (N). Now we need to use
some function like this:

function add_prepends(int asn, int num) {
  if num = 1 then {
    bgp_path.prepend(asn);
  } else if num = 2 then {
    bgp_path.prepend(asn);
    bgp_path.prepend(asn);
 } else if num = 3 then {
...
}

Usually the number of prepends is observable, so this function can fit
most of cases, but with available operator it will be a bit more
convenient, a little syntactic sugar. But it is not something that is
hard to live without, of course.

In my patch, I chose to "join" implementations of prepend() and
prepend_times(). It is questionable, because it requires some
additional supporting stuff if I understood right. So may be it is
better to implement it as separate operators.
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