Add command line option for changing default timeout

[danschultz]

Would be nice to have a command line option to specify the global timeout.

[whesse]

A number of issues with the buildbot have been caused by not being able to increase this internal timeout. This should be a higher priority. We are disabling debug runs because of this. This timeout is actually the one in scheduled_test, right?

@sgjesse @ricowind

[zoechi]

I think this is covered by #63 and #46

[whesse]

In our case, a command-line argument is much better than a file. The package directory might be shared with other configurations which are running with different parameters, or it might be read-only. Even if the configuration file can be specified on the command line, then we need to create a file somewhere, and then specify its path, rather than just putting the option on the command line. Perhaps the command line could accept the JSON or YAML that would be in the configuration file.

[nex3]

I agree that this should be done soon to get the bots happy.