Use salt for file management

Change-Id: I29fec2e91d86a14ea581d7596bc00b1dd881002f
diff --git a/tcp_tests/managers/saltmanager.py b/tcp_tests/managers/saltmanager.py
index a468b02..8ef817a 100644
--- a/tcp_tests/managers/saltmanager.py
+++ b/tcp_tests/managers/saltmanager.py
@@ -248,6 +248,10 @@
         result = self.local(tgt=tgt, fun='service.stop', args=service)
         return result['return']
 
+    def cmd_run(self, tgt, cmd):
+        result = self.local(tgt=tgt, fun='cmd.run', args=cmd)
+        return result['return']
+
     @utils.retry(3, exception=libpepper.PepperException)
     def sync_time(self, tgt='*'):
         LOG.info("NTP time sync on the salt minions '{0}'".format(tgt))