pacemaker: Change default op timeout from 10 minutes to 1 minute

10 minutes is way too long and people have time to think that something
is just totally broken. 1 minute is more reasonable. And in the worst
case, an attribute can be set to change this now.
Merge pull request #95 from vuntz/op-default-timeout

pacemaker: Change default op timeout from 10 minutes to 1 minute