added internet connection check before updating pip packages

Change-Id: Ie9010f447cf3512fa125afda10596ba844ab3b7c
diff --git a/src/com/mirantis/mk/Python.groovy b/src/com/mirantis/mk/Python.groovy
index 074e789..caa3f3f 100644
--- a/src/com/mirantis/mk/Python.groovy
+++ b/src/com/mirantis/mk/Python.groovy
@@ -29,7 +29,7 @@
     common.infoMsg("[Python ${path}] Setup ${python} environment")
     sh(returnStdout: true, script: virtualenv_cmd)
     try {
-        runVirtualenvCommand(path, "pip install -U setuptools pip")
+        runVirtualenvCommand(path, "wget -q -T 3 --spider http://google.com && pip install -U setuptools pip")
     } catch(Exception e) {
         common.warningMsg("Setuptools and pip cannot be updated, you might be offline")
     }