make all params for cookiecutter to be string

Change-Id: I9a13cdf3101132ab8a023e09d3c747c42d37e5fd
diff --git a/src/com/mirantis/mk/Python.groovy b/src/com/mirantis/mk/Python.groovy
index 6533276..6e4c164 100644
--- a/src/com/mirantis/mk/Python.groovy
+++ b/src/com/mirantis/mk/Python.groovy
@@ -230,7 +230,7 @@
     configFile = "default_config.yaml"
     configString = "default_context:\n"
     for (parameter in context) {
-      configString = "${configString}  ${parameter.key}: ${parameter.value}\n"
+      configString = "${configString}  ${parameter.key}: \"${parameter.value}\"\n"
     }
     writeFile file: configFile, text: configString
     command = ". ${path}/bin/activate; cookiecutter --config-file ${configFile} --output-dir ${outputDir} --overwrite-if-exists --verbose --no-input ${template}"