run_tests: Enhanced to call precmd/testcmd/postcmd.
run_tests: Enhanced to call precmd/testcmd/postcmd.

SumiTomohiko/fsyscall2,SumiTomohiko/fsyscall2,SumiTomohiko/fsyscall2,SumiTomohiko/fsyscall2,SumiTomohiko/fsyscall2