Fix system.set_system_time when no hw clock is present
Fix system.set_system_time when no hw clock is present

If a hardware clock is not present, then the `cmd.run_all` call in
`has_settable_hwclock` will return a non-zero retcode. If
`ignore_retcode` is not set to True in that call, then it will set
`__context__['retcode']` to that code which will cause the job to
appear as if it failed (due to non-zero retcode) even though it
didn't really fail.

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

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