Using salt-pepper to connect SALT_MASTER from Jenkins slaves

Due to specific Jenkins behavior of groovy interpreter it is impossible
to connect to SALT_MASTER_IP from Jenkins slaves. The solution has been
suggested by Jakub Josef so in order to cope with this issue salt-pepper
is used to connect to SALT_MASTER_IP from slaves.

Change-Id: I6537de0937383f6688224e609cb730e62a993b37
diff --git a/src/com/mirantis/mk/Python.groovy b/src/com/mirantis/mk/Python.groovy
index b95275f..29f471f 100644
--- a/src/com/mirantis/mk/Python.groovy
+++ b/src/com/mirantis/mk/Python.groovy
@@ -283,3 +283,13 @@
     echo(data)
     return data
 }
+
+/**
+ * Install salt-pepper in isolated environment
+ *
+ * @param path        Path where virtualenv is created
+ */
+def setupPepperVirtualenv(path) {
+    requirements = ['salt-pepper']
+    setupVirtualenv(path, 'python2', requirements)
+}
\ No newline at end of file