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Fix all thread locking bugs reported by object-locking test case. NB, some of the driver locking is getting too coarse. Driver mutexes really need to be turned into RW locks instead to significantly increase concurrency. * src/lxc_driver.c: Fix useof driver when unlocked in the methods lxcDomainGetInfo, lxcSetSchedulerParameters, and lxcGetSchedulerParameters * src/opennebula/one_driver.c: Fix missing unlock in oneDomainUndefine. Fix use of driver when unlocked in oneDomainGetInfo, oneGetOSType, oneDomainShutdown * src/qemu_driver.c: Fix use of driver when unlocked in qemudDomainSavem, qemuGetSchedulerType, qemuSetSchedulerParameters and qemuGetSchedulerParameters * src/storage_driver.c: Re-work storagePoolCreate to avoid bogus lock checking warning. Re-work storageVolumeCreateXMLFrom to remove a potential NULL de-reference & avoid bogus lock check warnings * src/test.c: Remove testDomainAssignDef since it break lock chekc warnings. * tests/object-locking.ml: Add oneDriverLock, oneDriverUnlock and one_driver_t methods/types to allow lock checking on the OpenNebula drivers