LU-12492 lnet: Deprecate live and dead router check params

LU-12492 lnet: Deprecate live and dead router check params

Rather than delete these params let's deprecate them for one release
and print a warning to console if the user is setting them.

Test-Parameters: trivial
Signed-off-by: Chris Horn <hornc@cray.com>
Change-Id: I5796996dd00b06a59a872e7e8453ab64afd65dd0
Reviewed-on: https://review.whamcloud.com/35387
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alexandr Boyko <c17825@cray.com>
Reviewed-by: Amir Shehata <ashehata@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>