sysctl.d: switch net.ipv4.conf.all.rp_filter from 1 to 2
    
    This switches the RFC3704 Reverse Path filtering from Strict mode to Loose
    mode. The Strict mode breaks some pretty common and reasonable use cases,
    such as keeping connections via one default route alive after another one
    appears (e.g. plugging an Ethernet cable when connected via Wi-Fi).
    
    The strict filter also makes it impossible for NetworkManager to do
    connectivity check on a newly arriving default route (it starts with a
    higher metric and is bumped lower if there's connectivity).
    
    Kernel's default is 0 (no filter), but a Loose filter is good enough. The
    few use cases where a Strict mode could make sense can easily override
    this.
    
    The distributions that don't care about the client use cases and prefer a
    strict filter could just ship a custom configuration in
    /usr/lib/sysctl.d/ to override this.
    
    Cherry-picked from: 230450d4e4f1f5fc9fa4295ed9185eea5b6ea16e
    Resolves: #1653824
    
    patch_name: 0053-sysctl.d-switch-net.ipv4.conf.all.rp_filter-from-1-t.patch
    present_in_specfile: true
    location_in_specfile: 53
    squash_commits: true