LU-11283 lnet: fix setting health value manually

LU-11283 lnet: fix setting health value manually

Changed the health value option letter to 't' instead
of 'h' to avoid conflict with help option.
Don't increment optind unnecessarily.
In the handling code in api-ni.c there was a missing return.

Test-Parameters: trivial
Signed-off-by: Amir Shehata <ashehata@whamcloud.com>
Change-Id: Ib56f19d1781e44297158c64c5b26004220a1db21
Reviewed-on: https://review.whamcloud.com/33074
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Sonia Sharma <sharmaso@whamcloud.com>
Reviewed-by: Doug Oucharek <dougso@me.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>