LU-10185 gnilnd: Change gnc_tx_bits to unsigned long

LU-10185 gnilnd: Change gnc_tx_bits to unsigned long

gnc_tx_bits declared as __u8. Change to unsigned long.

The goal is to align gnc_tx_bits[] to a 32 bit boundary.
The initial declaration I believe was not a good choice.
The use of the gnc_tx_bits makes more sense as a long than as a 8 bit
value.
It is used by:
static inline int test_and_clear_bit(int nr, unsigned long *addr);
unsigned long find_next_zero_bit(unsigned long *addr, unsigned long
size, unsigned long offset);
static inline int test_and_set_bit(int nr, unsigned long *addr);
all of which takes a unsigned long pointer.

Test-parameters: trivial

Signed-off-by: Chris Horn <hornc@cray.com>
Change-Id: I559e2a356182f253716d30f69bf675c485fe1b72
Reviewed-on: https://review.whamcloud.com/29897
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Doug Oucharek <dougso@me.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>