* src/logging.c src/logging.h src/libvirt_private.syms: define new functions virLogSetFromEnv and virLogParseDefaultPriority * qemud/qemud.c src/libvirt.c tests/eventtest.c: cleanup to use the unified functions
* tests/eventtest.c: don't covert high priority levels to debug level. Consider an invalid priority level setting a setup failure.