[Merge] ~till-kamppeter/network-manager:master into network-manager:master

[Till Kamppeter]

Till Kamppeter has proposed merging ~till-kamppeter/network-manager:master into network-manager:master.

Commit message:
nm.py autopkgtest: Added timers to make the main loops time out if the asynchronous processes do not finish.

Requested reviews:
  Network-manager (network-manager)

For more details, see:
https://code.launchpad.net/~till-kamppeter/network-manager/+git/network-manager/+merge/369586

This change avoids that in case of failure of the asynchronous operations the script does not get stuck in the main loop making the autopkgtest application killing it after hours and without clue about what went wrong. If the asynchronous operations do not finish withing 5 minutes the main loops which wait for them are stopped by timer.
This does not influence the probability of a test passing or failing due to tasks completing too slowly. It only improves debuggability.
-- 
Your team Network-manager is requested to review the proposed merge of ~till-kamppeter/network-manager:master into network-manager:master.
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