Instead of calling `find` uses POSIX functions to get files and directories listing

7 jobs from luaposix-find in 7 minutes and 17 seconds (queued for 5 seconds)
latest
Status Job ID Name Coverage
  Test
passed #179671
cppcheck

00:00:26

passed #179672
luacheck

00:00:26

passed #179669
system-tests

00:01:12

passed #179670
system-valgrind-tests

00:03:48

passed #179667
unit-tests

00:01:05

passed #179673
unit-valgrind-tests

00:03:29

failed #179668
unit-valgrind-tests

00:00:56