Allow SALT_MODELS_SYSTEM_REF_CHANGE in generating model

PROD-36517




Change-Id: Ic6a2ee4f44a81d4c05922c3b7d388b4752f20c27
diff --git a/src/com/mirantis/system_qa/SharedPipeline.groovy b/src/com/mirantis/system_qa/SharedPipeline.groovy
index e83a94b..0d4c5e3 100644
--- a/src/com/mirantis/system_qa/SharedPipeline.groovy
+++ b/src/com/mirantis/system_qa/SharedPipeline.groovy
@@ -445,6 +445,7 @@
                 string(name: 'DOMAIN_NAME', value: "${LAB_CONFIG_NAME}.local"),
                 string(name: 'REPOSITORY_SUITE', value: "${env.MCP_VERSION}"),
                 string(name: 'SALT_MODELS_SYSTEM_COMMIT', value: "${saltmodels_system_commit}"),
+                string(name: 'SALT_MODELS_SYSTEM_REF_CHANGE', value: env.SALT_MODELS_SYSTEM_REF_CHANGE),
                 string(name: 'COOKIECUTTER_TEMPLATE_COMMIT', value: "${cookiecuttertemplate_commit}"),
                 string(name: 'COOKIECUTTER_REF_CHANGE', value: "${cookiecutter_ref_change}"),
                 string(name: 'ENVIRONMENT_TEMPLATE_REF_CHANGE', value: "${environment_template_ref_change}"),