devlink: Add devlink health set command

devlink: Add devlink health set command

Add devlink set command which enables the user to configure parameters
related to the devlink health mechanism per reporter.
1) grace_period [msec] time interval between auto recoveries.
2) auto_recover [true/false] whether the devlink should execute automatic
recover on error.
Add a helper function to retrieve a boolean value as an input parameter.
Example:
$ devlink health set pci/0000:00:09.0 reporter tx grace_period 3500
$ devlink health set pci/0000:00:09.0 reporter tx auto_recover false

Signed-off-by: Aya Levin <ayal@mellanox.com>
Reviewed-by: Moshe Shemesh <moshe@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David Ahern <dsahern@gmail.com>