selftests/mm: thuge-gen: conform to TAP format output

selftests/mm: thuge-gen: conform to TAP format output

Conform the layout, informational and status messages to TAP.  No
functional change is intended other than the layout of output messages.

Also remove unneeded logging which isn't enabled.  Skip a hugepage size if
it has less free pages to avoid unnecessary failures.  For examples, some
systems may not have 1GB hugepage free.  So skip 1GB for testing in this
test instead of failing the entire test.

Link: https://lkml.kernel.org/r/20240202113119.2047740-11-usama.anjum@collabora.com
Signed-off-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>