staging: lustre: ldlm: use accessor macros for l_flags

Convert most of the ldlm lock's l_flags references from direct
bit twiddling to using bit specific macros.  A few multi-bit
operations are left as an exercise for the reader.

The changes are mostly in ldlm, but also in llite, osc and quota.
Also add a multi-bit (mask) test.

Signed-off-by: Bruce Korb <bruce.korb@gmail.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-2906


Reviewed-by: Keith Mannthey <Keith.Mannthey@intel.com>
Reviewed-on: http://review.whamcloud.com/7963


Reviewed-by: Doug Oucharek <doug.s.oucharek@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>