gnetworkmonitorbase: Use a hash table for storing networks
Rather than using an array, which requires a lot of iteration over it to check whether a particular network is present. Using a hash table only requires iteration in the can_reach() case, where we need to match a mask in the networks array, rather than equal it.
This should improve performance for large numbers of routes.
Signed-off-by: Philip Withnall withnall@endlessm.com
Fixes: #1925 (closed)