Add --skip-grains option to salt-run
Add --skip-grains option to salt-run

This will allow the user to skip grains generation and save the
2+ seconds it takes to generate grains for each call to `salt-run`.
Grains are not commonly used in runners.

Signed-off-by: Sergey Kizunov <dfddabaa9af05982b01940b837a87844148069c9@ni.com>

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt