Add locking to overlay-xfs-setup script
Add locking to overlay-xfs-setup script

We do that toensure that the script cannot run concurrently

[#156048188]

Signed-off-by: Julia Nedialkova <7434cf6db6c17ad5b6ef614abe065a9cda1d30c1@hotmail.com>

cloudfoundry-incubator/guardian-release,cloudfoundry-incubator/guardian-release,cloudfoundry-incubator/guardian-release