[yocto-perf] Build Perf Test Report for CentOS Linux 7 (Core)

[Yocto CentOS 7 Build Perf Tester]

Yocto build performance test report.

TEST METADATA:
==============
                      CURRENT COMMIT          COMPARING WITH      
Hostname:             ypperf-centos7          ypperf-centos7      
Branch:               master                  master              
Commit number:        51615                   51568               
Commit:               02aff2ad81d49482fd2d    4434777705cf49300a7d
Number of test runs:  3                       24                  

TEST RESULTS:
=============
  test1: Build core-image-sato
         - build time              2:11:10  ->  nan          nan   +nan %
         - tmpdir size           56.04 GiB  ->  nan          nan   +nan %
         - rootfs size          309.11 MiB  ->  nan          nan   +nan %
                                                                         
  test12: Build virtual/kernel
           build time               7:34.8  ->  7:50.5   +15.7 s   +3.5 %
                                                                         
  test13: Build core-image-sato with rm_work enabled
         - build time              2:10:59  ->  nan          nan   +nan %
         - tmpdir size            8.96 GiB  ->  nan          nan   +nan %
                                                                         
  test2: Run core-image-sato do_rootfs with sstate
         - do_rootfs time           2:10.4  ->  nan          nan   +nan %
                                                                         
  test3: Bitbake parsing (bitbake -p)
           parse_1 time             27.3 s  ->  27.1 s   -0.17 s   -0.6 %
           parse_2 time             17.1 s  ->  17.1 s   +0.00 s   +0.0 %
           parse_3 time              1.8 s  ->  1.7 s    -0.03 s   -1.7 %
                                                                         
  test4: eSDK metrics
         - installer_bin size     3.01 GiB  ->  nan          nan   +nan %
         - deploy time              2:35.7  ->  nan          nan   +nan %
         - deploy_dir size        8.21 GiB  ->  nan          nan   +nan %
                                                                         

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