Improve bazel http timeouts

[mjonss]

Enhancement

Currently when running bazel, it is using the default http timeouts, starting with 60 second.
And we have also configured to use caches, that are not public, to speed up local download, so the timeouts are mostly affecting external developers

We should make the impact of these caches smaller, by having better timeouts.

Currently it took ~9 minuts to run make bazel_prepare on empty local cache when it should probably be possible to do it under 2 minutes.

[mjonss]

The better solution is probably to have a custom http_archive() function which would filter the urls like this:

for url in urls:
  if host(url) in AccessibleHosts
    use this url
  if host(url) in NonAccessibleHosts
    skip this url and use next
  # Unknown host, test if accessible or not
  # Either by ping the host or trying downloading the file with a timeout.
  # and populate AccessibleHosts/NonAccessibleHosts depending on result