Revert "LU-12222 lnet: Check if we're sending to ourselves"

Revert "LU-12222 lnet: Check if we're sending to ourselves"

This reverts commit e4af756e1f428a9f7883bf883f66941defb1447f.

Commit e4af756 causes an assert when combined with patch
    https://review.whamcloud.com/36512
    LU-12889 lnet: Do not assume peers are MR capable
Since the 36512 patch is fixing a more serious bug, this
patch is reverted to allow that fix to land.

Signed-off-by: Chris Horn <hornc@cray.com>
Change-Id: I6f3c1e7f7b2858f4aa330b53880fbcc815c1e2c7
Reviewed-on: https://review.whamcloud.com/37259
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alexey Lyashkov <c17817@cray.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>