Add --set-metadata option to salt-call

[skizunov]

What does this PR do?

Works the same as the --metadata option in the salt command.
Since --metadata was already taken in salt-call to mean
something else, went with --set-metadata for salt-call.

Tests written?

No

Signed-off-by: Sergey Kizunov sergey.kizunov@ni.com

[skizunov]

The test failure doesn't seem related to this change:

23:34:48 ======================================================================
23:34:48 ERROR [0.026s]: test_uptime_return_success_not_supported (unit.modules.status_test.StatusTestCase)
23:34:48 [CPU:20.0%|MEM:33.7%|Z:0] 
23:34:48 ----------------------------------------------------------------------
23:34:48 Traceback (most recent call last):
23:34:48   File "/usr/lib/python2.7/site-packages/mock.py", line 1201, in patched
23:34:48     return func(*args, **keywargs)
23:34:48   File "/testing/tests/unit/modules/status_test.py", line 149, in test_uptime_return_success_not_supported
23:34:48     status.uptime()
23:34:48   File "/testing/salt/modules/status.py", line 180, in uptime
23:34:48     return __salt__['cmd.run']('uptime')
23:34:48 KeyError: 'cmd.run'

[cachedout]

@skizunov That's an error that slipped in accidentially earlier today. It's resolved now and unrelated to your change as you mention.