[LTP] [RFC] testcases: unify naming for syscall tests ending in digits

[Jinseok Kim]

Hi All,

I noticed both styles are used for tests of syscalls ending in digits:

For example:
  dup2/dup201.c
  dup3/dup3_01.c

Would it be better to unify them as dup2_01.c / dup3_01.c for consistency?

Thanks.