LU-11152 lnd: test fpo_fmr_poool pointer instead of special bool

LU-11152 lnd: test fpo_fmr_poool pointer instead of special bool

For the ko2iblnd driver it sets a fpo_is_fmr bool to tell use if
a pool was allocated. The name fpo_is_fmr is very misleading to
its function and its a weak test to tell us if a pool was allocated
in the FMR case. It is much easier to test the actually FMR pool
pointer then manually setting a bool flag to tell us if the FMR
pool is valide.

Test-Parameters: trivial
Change-Id: Ib5fa14f4a9d2b89efe5f453e0f243699894f3aeb
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/33408
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Amir Shehata <ashehata@whamcloud.com>
Reviewed-by: Sonia Sharma <sharmaso@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>