LU-13569 lnet: Deprecate lnet_recovery_interval

LU-13569 lnet: Deprecate lnet_recovery_interval

We no longer use a static recovery interval, so remove its remaining
uses and add warning that it has been deprecated.

Test-Parameters: trivial
HPE-bug-id: LUS-9109
Signed-off-by: Chris Horn <chris.horn@hpe.com>
Change-Id: Iedc79803ef5b7ba041a531961eb77acd338abfb5
Reviewed-on: https://review.whamcloud.com/39722
Reviewed-by: Neil Brown <neilb@suse.de>
Reviewed-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>