Refresh HWE kernel, and extra repo

Change-Id: Id5fafc43fcfdcd40aa14d59acfbc387de1874310
diff --git a/common/ubuntu_salt_bootstrap.sh b/common/ubuntu_salt_bootstrap.sh
index 3510b85..f03f757 100644
--- a/common/ubuntu_salt_bootstrap.sh
+++ b/common/ubuntu_salt_bootstrap.sh
@@ -17,7 +17,7 @@
 GIT_SALT_FORMULAS_SCRIPTS_REF=${GIT_SALT_FORMULAS_SCRIPTS_REF:-master}
 
 function process_repos(){
-# TODO: those  should be unhardcoded and re-writed to mirror.mirantis.com logic
+# TODO: those  should be unhardcoded and re-writed, using CC model
 wget -O - ${SALTSTACK_GPG} | sudo apt-key add -
 wget -O - ${APT_MIRANTIS_GPG} | apt-key add -
 wget -O - http://mirror.mirantis.com/${FORMULA_VERSION}/extra/xenial/archive-extra.key | apt-key add -