Add return code support to `pid`.
Test: pid nonexistent; echo $? Test: pid --exact nonexistent; echo $? Change-Id: If8efb1ca27ae3ed7b5be1c51179fae387c56e305
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Test: pid nonexistent; echo $? Test: pid --exact nonexistent; echo $? Change-Id: If8efb1ca27ae3ed7b5be1c51179fae387c56e305