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* Add trace point for perf tool in xcatd (#903) This patch aims to enable nytprof library to analyze the performance of xcat code in statement level. - Add perf trace point in xcatd - Add sleep time for db prcess to solve the race condition when - perf instraction is used. More reference To enable prof: perl -dt:NYTProf /opt/xcat/sbin/xcatd -f Some perf test sample: https://github.com/chenglch/xcatperf * refine the performance of makedhcp (#2901), it including: - refine the code logic in getSNList to get better performance - refine the getipaddr, cache the dns lookup result - refine noderangecontainsMn - refine ishostinsubnet