LU-11297 lnet: invalidate recovery ping mdh

LU-11297 lnet: invalidate recovery ping mdh

For cleanliness, ensure that recovery ping mdh is invalidated when
an peer ni or a local ni are allocated

Test-Parameters: forbuildonly
Signed-off-by: Amir Shehata <ashehata@whamcloud.com>
Change-Id: If06448b1602b3680831244923b6b982a555159ea
Reviewed-on: https://review.whamcloud.com/34771
Reviewed-by: Olaf Weber <olaf.weber@hpe.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>
Reviewed-by: Chris Horn <hornc@cray.com>
Tested-by: Jenkins