If the initialization thread is interrupted by contextDestroyed, make that clear.

Otherwise get a meaningless error:
java.lang.InterruptedException
    at java.lang.Object.wait(Native Method)
    at java.lang.Object.wait(Object.java:502)
    at org.jvnet.hudson.reactor.Reactor.execute(Reactor.java:267)
    at jenkins.InitReactorRunner.run(InitReactorRunner.java:44)
    at jenkins.model.Jenkins.executeReactor(Jenkins.java:915)
    at jenkins.model.Jenkins.<init>(Jenkins.java:814)
    at hudson.model.Hudson.<init>(Hudson.java:83)
    at hudson.model.Hudson.<init>(Hudson.java:79)
    at hudson.WebAppMain$3.run(WebAppMain.java:225)