Hooks validation tests cannot pass #781

Running the validation/hooks/hooks.t tests should pass, but they always fail.

For example, using runc:

RUNTIME=runc ./validation/hooks/hooks.t
TAP version 13
  ---
  {
    "error": "Hooks MUST be called in the listed order\nRefer to: https://github.com/opencontainers/runtime-spec/blob/v1.1.0/config.md#posix-platform-hooks\nThe runtime MUST run the user-specified program, as specified by `process`\nRefer to: https://github.com/opencontainers/runtime-spec/blob/v1.1.0/runtime.md#lifecycle"
  }
  ...
1..0

Seems to be two issues here:

1. The bundle directory (where the output file is stored) is deleted (in RuntimeLifecycleValidate) before the output file is read for comparison:

   runtime-tools/validation/hooks/hooks.go

   Lines 77 to 78 in f7e3563

   	err := util.RuntimeLifecycleValidate(config)
   	outputData, _ := os.ReadFile(output)

   Because of this:
   1. The content of outputData is always empty.
   2. We don't see the 'file not found' error from os.ReadFile because it's ignored.
2. Even if outputData was populated per the specified hooks, the comparison of its content will always fail:

   runtime-tools/validation/hooks/hooks.go

   Line 79 in f7e3563

   if err == nil && string(outputData) != "pre-start1 called\npre-start2 called\npost-start1\npost-start2\npost-stop1\npost-stop2\n" {

   1. Actual content: pre-start1 called\npre-start2 called\npost-start1 called\npost-start2 called\npost-stop1 called\npost-stop2 called\n
   2. Asserted content: pre-start1 called\npre-start2 called\npost-start1\npost-start2\npost-stop1\npost-stop2\n
   3. Note the lack of called postfix for post-startx and post-stopx hooks.