CI: RF-Sim-Test-4G replace node name by localhost

By configuring the Jenkins pythonExecutor to match the test machine, we can use
localhost as the node for running individual test cases. This change makes it
easy to move tests across machines, as the only adjustment needed is updating
the pythonExecutor in Jenkins.

ci-scripts/xml_files/container_4g_rfsim_fembms.xml

@@ -80,9 +80,9 @@
                 <class>Iperf2_Unidir</class>
                 <desc>Iperf2 UDP DL</desc>
                 <id>rfsim4g_ue_fembms</id>
-                <nodes>acamas</nodes>
+                <nodes>localhost</nodes>
                 <svr_id>rfsim4g_enb_fembms</svr_id>
-                <svr_node>acamas</svr_node>
+                <svr_node>localhost</svr_node>
                 <iperf_args>-u -t 30 -b 2M</iperf_args>
                 <iperf_packetloss_threshold>25</iperf_packetloss_threshold>
                 <iperf_bitrate_threshold>80</iperf_bitrate_threshold>