fs/gpfs: Solve issues while setting GPFS hints

1- Remove the common symbols issue: global variable not initialized. (#7424)
Move the variables to local scope within the set_info function.
2- Remove GPFS hints using datashipping: not used anymore
3- Redirect output stream to corresponding fs framework.

Signed-off-by: raafatfeki <[email protected]>

Author: raafatfeki