Revert "Also insist that the vmod name matches before reusing, to cater for hardlinks."

This reverts commit caa376943e315def7cee814008f01a0796d8e1d9.
Revert "Do a stat(2) check of inode/dev to detect changed vmod files."

This reverts commit 36123ef1db0a007fb4dfe5edb485e427a7030da5.