ifupdown: support post-up / pre-down hooks

function                                             old     new   delta
set_environ                                          330     371     +41
ifupdown_main                                       2156    2194     +38
iface_up                                              97     113     +16
iface_down                                            97     113     +16
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(add/remove: 0/0 grow/shrink: 4/0 up/down: 111/0)             Total: 111 bytes

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
1 file changed