to fix error:
stderr: /lkp/benchmarks/perf/perf: error while loading shared libraries: libpython2.7.so.1.0: cannot open shared object file: No such file or directory
		stderr: /lkp/benchmarks/perf/perf: error while loading shared libraries: libpython2.7.so.1.0: cannot open shared object file: No such file or directory
		stderr: /lkp/benchmarks/perf/perf: error while loading shared libraries: libpython2.7.so.1.0: cannot open shared object file: No such file or directory
		stderr: failed to build lmbench3

rt with fix:
/result/lmbench3/performance-development-100%-MMAP-50%-ucode=0x7000019/lkp-bdw-de1/debian-10.4-x86_64-20200603.cgz/x86_64-rhel-8.3/gcc-9/ba47d845d715a010f7b51f6f89bae32845e6acb7/8

Signed-off-by: Xia Hui <hui.xia@intel.com>
Signed-off-by: Philip Li <philip.li@intel.com>