[cleanup] Move default storage dir to /var/lib

[cleanup] Move default storage dir to /var/lib

Since we switched to dockerized Salt master and mounting the full
contents of the current git repo inside cfg01's /root/fuel dir,
exposing temporary deploy artifacts should be avoided, i.e. the
default temporary storage location (configurable via '-S' deploy arg)
should be moved outside the git repo.

JIRA: FUEL-383

Change-Id: I32f7197b018fd853867de42f5618650ac9022dc9
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>