Fixed when SystemServerInitThreadPool.shutdown() is called.

The class' Javadoc says it's shut down after P HASE_BOOT_COMPLETED, whic was
not the case.

Test: manual verification / boot
Fixes: 156257347

Change-Id: I3c8b24c6855c7c83cdf1eacc637b8e064a121fe3
3 files changed