A script to run CI tests locally.

Added ./run_locally.sh script. The script takes one argument being the testcase
that one wants to run. The testcase is run locally. This means that some testcases that
utilize hardware resources will not run. However most if not all rfsimulator testcases
should run as in CI.

To this end, the CI python scripting framework was updated, adding --local flag which changes
the script behavior as follows:
 - overrides <node> and <srv_node> XML elements to 'localhost' so all commands are executed locally
 - Avoid running image pull, image cleanup and workspace creation steps of the scripts:
   user is responsible for that

ci-scripts/helpreadme.py

@@ -43,6 +43,8 @@ def GenericHelp(vers):
 	print('      InitiateHtml, FinalizeHtml')
 	print('      TerminateeNB, TerminateHSS, TerminateMME, TerminateSPGW')
 	print('      LogCollectBuild, LogCollecteNB, LogCollectHSS, LogCollectMME, LogCollectSPGW, LogCollectPing, LogCollectIperf')
+	print('  --local Force local execution: rewrites the test xml script before running to always execute on localhost. Assumes')
+	print('          images are available locally, will not remove any images and will run inside the current repo directory')
 
 def GitSrvHelp(repository,branch,commit,mergeallow,targetbranch):
 	print('  --ranRepository=[OAI RAN Repository URL]                                      -- ' + repository)