Prep work for creating jenkins v2.10 and 2.11 job views.

jjb/pipeline/voltha/master/*
----------------------------
  o Update copyright notice to be current.

jjb/pipeline/voltha/voltha-2.10/bbsim-tests.groovy
--------------------------------------------------
  o Debugging: augment script to self-identify
  o Debugging: determine if a shell command is available.

jjb/verify/bbsim.yaml
---------------------
  o Add a version definition and bbsim test job for 2.10 & 2.11

vars/installVoltctl.groovy
--------------------------
  o Convert if-then-else block into a dictionary to simplify
    version detection logic.
  o Minor cleanups for the shellcheck tool
     o Quote environment vars
     o Fold long shell pipelines across multiple lines for readability.
  o [DEBUG] Added enter/leave printlns() to help identify a problem
    source from context in the log.  Null appeared in a kubectl setup
    for etcd.

Change-Id: I3fa824dffc1f37614c569faa1e1829a7466202b3
diff --git a/Makefile b/Makefile
index cd0ef9d..6a0bfd7 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,5 @@
+# -*- makefile -*-
+
 # Makefile for testing JJB jobs in a virtualenv
 .PHONY: test clean
 
@@ -23,4 +25,6 @@
 	jenkins-jobs -l DEBUG test --recursive --config-xml -o $(JOBCONFIG_DIR) jjb/ ;
 
 clean:
-	rm -rf $(VENV_DIR) $(JOBCONFIG_DIR)
+	$(RM) -r $(VENV_DIR) $(JOBCONFIG_DIR)
+
+# [EOF]