ipapply:  Disable for an hour when /tmp/ipapply_disabled exists.

This is useful for gftests which need ipapply not to mess with
statically configured IP addresses.  When the file is at least an hour
old, the effect will be disabled (so as to prevent testbeds from
getting stranded).

Change-Id: I2801415a358daa6852db337e727446e47740b547
2 files changed