LU-10564 kernel: kernel update RHEL6.9 [2.6.32-696.20.1.el6]

LU-10564 kernel: kernel update RHEL6.9 [2.6.32-696.20.1.el6]

Update RHEL6.9 kernel to 2.6.32-696.20.1.el6

Test-Parameters: clientdistro=el6.9 mdsdistro=el6.9 \
  ossdistro=el6.9 mdtfilesystemtype=ldiskfs \
  ostfilesystemtype=ldiskfs testgroup=review-ldiskfs

Signed-off-by: Bob Glossman <bob.glossman@intel.com>
Change-Id: I5d72a5416e091b2690f56764eb4d195b8137d405
Reviewed-on: https://review.whamcloud.com/31066
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Minh Diep <minh.diep@intel.com>
Reviewed-by: Yang Sheng <yang.sheng@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>