common: NVML renaming and library splitting

Fix cstyle
Add unit tests for traces, check environment variable:
PMEM_LOG_FILE, PMEMBLK_LOG_FILE, PMEMLOG_LOG_FILE, PMEMOBJ_LOG_FILE
common: NVML renaming and library splitting

Reduce tests for traces, check environment variable:
PMEM_LOG_FILE, PMEMBLK_LOG_FILE, PMEMLOG_LOG_FILE, PMEMOBJ_LOG_FILE
common: add *_set_funcs() to all modes