[Swan-commit] Changes to ref refs/heads/master

[Andrew Cagney]

New commits:
commit 725cf020349664cd97f2a3264b8df2e2d5587295
Author: Andrew Cagney <cagney at gnu.org>
Date:   Sun Jul 28 09:21:20 2019 -0400

    subnet: implement subnet_{mash,floor,ceiling} using a common mashup() function, test
    
    Where mashup() strips :PORT from the subnet's (routepoint's) endpoint
    and then applies applicable masks to the underlying PREFIX|HOST
    address.
    
    subnet_mask() replaces maskof().
    subnet_{floor,ceiling}() drops ip_ prefix.