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contint: tmpfs is now root:root and world writable

Description

contint: tmpfs is now root:root and world writable

When enabling the tmpfs on labs instances, we found out that the instance
ends up deadlocked upon reboot. The jenkins-slave user is not known to
the bootup mount command since it is only in LDAP.

Instead, change the contint tmpfs to be owned by root:root, world
writable and with prevent deletion bit set (1777).

The file {} directive does not set any user/group/mode to prevent puppet
from changing them after the tmpfs has been mounted.

Bug: T76250
Change-Id: I4713ff77a7835ec5cd1dc000c85198732e40ed64