Changed the default path for the offline iperf packages

The default path to the offline iperf3 package and its dependencies
is set to /opt/packages now due to the new approach with the offline
toolset image where these packages are already present.

With new iperf3 version at /opt/packages, we need more dependencies,
so the search for the offline packages is changed.

Change-Id: If2dbe537a25905ec7260a5133e1956f60ae2c73e
diff --git a/utils/ssh.py b/utils/ssh.py
index 29a56f0..0d82c52 100644
--- a/utils/ssh.py
+++ b/utils/ssh.py
@@ -126,8 +126,10 @@
 
     def put_iperf3_deb_packages_at_vms(self, source_directory,
                                        destination_directory):
-        iperf_deb_files = [f for f in os.listdir(source_directory)
-                           if "deb" in f]
+        required_packages = ['iperf3', 'libiperf0', 'libsctp1']
+        iperf_deb_files = [pack for pack in os.listdir(source_directory) if
+                           any(req in pack for req in required_packages) if
+                           pack.endswith('.deb')]
         if not iperf_deb_files:
             raise BaseException(
                 "iperf3 *.deb packages are not found locally at path {}. "
@@ -190,7 +192,7 @@
         if internet_at_vms.lower() == 'false':
             logger.info("Copying offline iperf3 deb packages, installing...")
             path_to_iperf_deb = (config.get('iperf_deb_package_dir_path') or
-                                 "/artifacts/mos-spt/")
+                                 "/opt/packages/")
             home_ubuntu = "/home/ubuntu/"
             transport.put_iperf3_deb_packages_at_vms(path_to_iperf_deb,
                                                      home_ubuntu)