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By default /var/volatile will be mounted with tmpfs_t instead of var_t
label, which will cause us to have to add some extra rules to eliminate
avc denials of some services.

Set rootcontext for /var/volatile in fstab to make sure it is mounted
with correct label.
Signed-off-by: Yi Zhao <yi.zhao@windriver.com>
Signed-off-by: Joe MacDonald <joe@deserted.net>