Slave should wait for IsolationModule::resourcesChanged() to complete before 
launching tasks
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                 Key: MESOS-82
                 URL: https://issues.apache.org/jira/browse/MESOS-82
             Project: Mesos
          Issue Type: Bug
          Components: isolation, slave
            Reporter: Charles Reiss


Currently, the Slave dispatches resourcesChanged() when launching new tasks and 
has no indication of when this completes. Instead, it should get some signal 
from the isolation module about when the resource adjustment is complete to 
ensure that executors are not told to start tasks while they might be killed 
for trying to use the resources those tasks require.

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