Allow to resolve salt in rust module tests
6fcc0848d68a
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Description

Allow to resolve salt in rust module tests

Summary:
Fixes the following issue:

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ERROR: test_get_rustc_triplet (test_rust.Testinstance)
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Traceback (most recent call last):
  File "/opt/salt/nasqueron-operations/_tests/modules/test_rust.py", line 11, in test_get_rustc_triplet
    triplet = rust.get_rustc_triplet()
  File "../_modules/rust.py", line 35, in get_rustc_triplet
    return __salt__["cmd.shell"]("rustc -vV | sed -ne 's/^host: //p'")
NameError: name '__salt__' is not defined

Test Plan: make test

Reviewers: dereckson

Reviewed By: dereckson

Differential Revision: https://devcentral.nasqueron.org/D2574