RootStorageSvc+RootAuxDynIO: Make ioMutex recursive.
ioMutex needs to be recursive; it is possible to recursively enter the APR code when reading view vectors.
Fixes deadlock seen in DataModelRunTests.
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ioMutex needs to be recursive; it is possible to recursively enter the APR code when reading view vectors.
Fixes deadlock seen in DataModelRunTests.