support for %%currenthost%% host names for modules in ci_infra

It can be set using nodes and svr_node tags in xml files

ci-scripts/xml_files/container_5g_rfsim_tdd_dora.xml

@@ -71,6 +71,7 @@
                 <class>Ping</class>
                 <desc>Ping gNB from NR-UE</desc>
                 <id>rfsim5g_ue</id>
+                <nodes>localhost</nodes>
                 <ping_args>-c20 -i0.2 10.0.1.1</ping_args>
                 <ping_packetloss_threshold>0</ping_packetloss_threshold>
         </testCase>
@@ -79,6 +80,7 @@
                 <class>Ping</class>
                 <desc>Ping NR-UE from gNB</desc>
                 <id>rfsim5g_gnb_nos1</id>
+                <nodes>localhost</nodes>
                 <ping_args>-c20 -i0.2 10.0.1.2</ping_args>
                 <ping_packetloss_threshold>0</ping_packetloss_threshold>
         </testCase>