Revise inodewatch2.stp to work on a wider range of kernels and filesystems

Revise inodewatch2.stp to work on a wider range of kernels and filesystems

The inodewatch2.stp instrumented specific functions that actually
changed the the mode of the inode.  Depending on the file system used
the orginally instrumented functions would miss chmod operations on
some file systems.  Moved the instrumentation to the common
notify_change function that all the operations go through.