Fix typo in pip update handling

Change-Id: Ia5387e7a664804bf1677c8856b8e4df3ee7e59f5
diff --git a/src/com/mirantis/mk/Python.groovy b/src/com/mirantis/mk/Python.groovy
index 476562a..5178ca5 100644
--- a/src/com/mirantis/mk/Python.groovy
+++ b/src/com/mirantis/mk/Python.groovy
@@ -29,7 +29,7 @@
     try {
         runVirtualenvCommand(path, "pip install -U setuptools pip")
     } catch(Exception e) {
-        common.warnMsg("Setuptools and pip cannot be updated, you might be offline")
+        common.warningMsg("Setuptools and pip cannot be updated, you might be offline")
     }
     if (reqs_path==null) {
         def args = ""