benoitc 418f140445 remove file locking
This changes improve the binary upgrade behaviour using USR2:

- only one binary upgrade can happen at a time: the old arbiter needs to be
  killed to promote the new arbiter.
- if a new arbiter is already spawned, until one is killed USR2 has no action
- if a new arbiter has been spawned, the unix socket won't be unlinked
- until the old arbiter have been killed the newly created pidfile has the name
  <pidfile>.2 and the name Master.2 .

Note: there is no dialog between both arbiters to handle this features.
Instead they will supervise each others until one is killed. So isolation is
still guaranted.

fix #1267
2016-05-20 15:42:55 +02:00
..
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2016-05-20 15:42:55 +02:00
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